Which Wi-Fi Antenna Cable to Choose: A Complete Guide to Types, Losses, and Connections

Choosing the right cable for your Wi-Fi antenna isn't just a technical formality, but a critical factor that determines how stable and fast your wireless connection will be. Even the most powerful, high-gain antenna (dBi) is useless if the signal is lost in a poor-quality or unsuitable cable. Cable losses can reach 50-70% at frequencies 5 GHz, which means that instead of what was promised 1 Gbps you will get barely crawling 200-300 Mbps — and it won’t be the router’s or the provider’s fault, but rather the incorrectly selected cable.

In this article, we will look at what types of cables exist for connecting Wi-Fi antennas, how to distinguish them by markings, and what influences wave resistance, attenuation per meter And shielding materialYou will find out why it is cheap. RG-58 can negate all efforts to strengthen the signal, and expensive LMR-600 — is overkill for a home network. We'll also cover practical connection examples, common mistakes, and provide a checklist for verifying installation quality.

If you are planning to run the cable on 10+ meters or work on frequency 5 GHzThis material will help you avoid common mistakes and save on re-purchasing equipment.

1. Main types of cables for Wi-Fi antennas: comparison and features

All cables for connecting Wi-Fi antennas belong to the class coaxial They consist of a core, a dielectric, a shield, and an outer sheath. However, their characteristics vary greatly depending on the design and materials. The key parameters to consider are:

• 📏 Wave resistance: for Wi-Fi equipment the standard is 50 Ohm (less often) 75 Ohm for television). Using a cable with a different resistance will result in signal reflection and losses of up to 30%.
• 📉 Attenuation (loss per meter): measured in dB/m and depends on the frequency. For example, RG-58 on 2.4 GHz loses ~0.2 dB/m, and on 5 GHz — already ~0.4 dB/m.
• 🛡️ Shielding: can be foil, braided, or a combination of both. The better the shielding, the less interference from other devices.
• 🌡️ Temperature range: Important for outdoor installations. Cheap cables crack in temperatures below -20°C.

Below is a table comparing the most popular types of Wi-Fi antenna cables:

As can be seen from the table, RG-58 — the cheapest, but also the most power-hungry option. It's only suitable for short indoor connections (for example, from a router to an external antenna on a balcony). For outdoor installations or long runs (>10 m), it's better to choose LMR-400 or H-155.

2. How does Wi-Fi frequency affect cable selection?

The signal frequency directly determines how much it will be attenuated in the cable. For example, at a frequency 2.4 GHz (standard 802.11n) losses in RG-58 will be ~0.2 dB/m, and on 5 GHz (standard 802.11ac/ax) — already ~0.4 dB/m. This means that with a cable length 10 meters you will lose:

• 📶 2 dB on 2.4 GHz (~30% of the signal)
• 📶 4 dB on 5 GHz (~60% of the signal)

For modern networks Wi-Fi 6 (802.11ax), operating on the frequency 5-6 GHz, it is recommended to use cables with attenuation of no more than 0.15 dB/mOtherwise, the connection speed will drop to the level Wi-Fi 4 (802.11n), despite support for new standards.

Frequency selection rule:

• 🔵 2.4 GHz: can be used RG-213 or LMR-400 (up to 20 m).
• 🟢 5 GHz: only LMR-400, H-155 or better (up to 15 m).
• 🟣 6 GHz (Wi-Fi 6E): LMR-600 or specialized low-loss cables (up to 10 m).

⚠️ Attention: Many manufacturers specify attenuation only for 1 GHz — it's a marketing ploy. For Wi-Fi, you need to look at the specifications on 2.4 GHz And 5 GHz! For example, in the datasheet on RG-58 It may say "0.1 dB/m", but this value is for 100 MHz, not for Wi-Fi.

3. Shielding material: why is braid better than foil?

Cable shielding protects the signal from external interference (such as a nearby microwave or LTE tower). The better the shielding, the more stable the connection. There are three main types:

• 🧵 Braiding (braided shield): a coating made of interwoven copper wires. Bends well, but only covers 60-80% surfaces.
• 📄 Foil (foil shield): a thin layer of aluminum or copper. Inexpensive, but fragile and covers 100% surfaces.
• 🛡️ Combined (foil + braid): foil + braid. Optimal option for Wi-Fi (coverage) 90-95%).

For outdoor installation or installation near sources of interference (for example, along electrical wiring), it is better to choose cables with double shielding (For example, LMR-400 or H-155). Cheap cables with single shield" (RG-58) may allow interference to pass through, which will lead to loss packages And ping spikes in games or video calls.

Example from practice: The user extended RG-58 15 m long for connecting an external antenna Ubiquiti Loco M2As a result, the speed dropped from 300 Mbps to 50 Mbps during peak hours when neighbors were actively using microwaves. Replacement with LMR-400 solved the problem - the signal became stable even under load.

How to check the quality of shielding?

If you have access to an oscilloscope or spectrum analyzer, you can measure the level of interference on the cable. At home, it's easier to focus on connection stability: if the speed fluctuates when you turn on appliances, the shielding is insufficient.

4. Connectors and their impact on signal loss

Even the perfect cable will lose some signal if poor-quality or inappropriate connectors are used. The most commonly used Wi-Fi antennas are:

• 🔌 N-type: reliable, low loss (~0.1 dB), but bulky. Used for outdoor antennas.
• 🔌 SMA: compact, but loss is ~0.3 dB. Suitable for indoor antennas.
• 🔌 RP-SMA ("reverse SMA"): same as SMA, but with reverse threads. Check compatibility carefully!
• 🔌 TNC: similar to N-type, but smaller in size. Loss ~0.2 dB.

⚠️ Attention: Mismatched connectors are one of the most common errors. For example, if the antenna N-male, and on the cable N-female, you will need an adapter that will add another 0.2-0.5 dB of lossIt's better to buy a cable with the right connectors right away or solder them yourself.

How to minimize losses in connectors?

1. Use minimum number of connectionsEach adapter/connector adds ~0.2 dB of loss.
2. Check it out soldering qualityPoor contact can add up to 1-2 dB losses.
3. For outdoor use, use connectors with hermetic seals (For example, N-type with silicone gaskets).

Make sure the connectors on the cable and antenna match in type and gender (male/female)

Check the threads for damage.

Use dielectric grease for outdoor connections

Measure the losses with a tester (if possible)-->

5. Practical connection diagrams: examples for different tasks

Let's look at three Wi-Fi antenna connection scenarios and the optimal cable selection for each:

Scenario 1: Signal booster in an apartment (up to 5 m)

• 📡 Antenna: Internally directed (eg TP-Link TL-ANT2408CL).
• 🔗 Cable: RG-58 or RG-213 (losses are not critical at short range).
• 🔌 Connectors: SMA or RP-SMA (depending on the router).

Losses: ~1 dB (20% of signal). Suitable for boosting the signal from the router to a remote room.

Scenario 2: External antenna on the balcony (5-15 m)

• 📡 Antenna: Outdoor omnidirectional (eg Ubiquiti AMO-2G13).
• 🔗 Cable: LMR-400 (loss ~1.5 dB at 10 m for 5 GHz).
• 🔌 Connectors: N-type (for the street).

Losses: ~1.5-2 dB (30% of signal). Sealed connections required!

Scenario 3: Rooftop Access Point (15-50m)

• 📡 Antenna: Directional sectorial (eg MikroTik SXTsq 5).
• 🔗 Cable: H-155 or LMR-600 (loss ~0.5 dB at 10 m for 5 GHz).
• 🔌 Connectors: N-type with seals + lightning protection.

Losses: ~2-3 dB (50% of the signal). It is recommended to use an amplifier (LNA) on the receiving side.

6. Typical mistakes when selecting and installing cables

Wi-Fi antenna cable errors can cause even expensive equipment to perform worse than it could. Here are the most common mistakes:

• ❌ Using a TV cable RG-6 (75 Ohm): the wave impedance does not match, the losses reach 3-5 dB.
• ❌ Laying cables next to electrical wiring: interference from 220V creates interference, especially on 2.4 GHz.
• ❌ Ignoring the bend radius: sharp bends (less 5×cable diameter) increase attenuation.
• ❌ Lack of lightning protection for outdoor antennas: Even if the cable is shielded, the discharge can pass through the braid and burn out the router.
• ❌ Saving on connectors: cheap "Chinese" SMA often have poor contact, adding 0.5-1 dB losses.

⚠️ Attention: If you are running cable outdoors, be sure to use cable channel or corrugated pipe — ultraviolet radiation destroys the outer shell within 1-2 seasons, and rain and snow penetrate through microcracks, causing corrosion of the screen.

How to check if the cable is damaged?

• 🔍 Visually: the braid is oxidized, the sheath is cracked.
• 📶 On signal: the RSSI level on the router drops by 10+ dB after connecting the cable.
• 🌡️ By temperature: the cable heats up at the point of damage (short circuit).

7. How to calculate total cable losses?

To understand how much signal your cable is "eating up", use the formula:

Total Loss (dB) = (Attenuation per meter × Cable length) + Connector Loss

Example: you have LMR-400 10 m long for the antenna on 5 GHz with two connectors N-type.

• Attenuation LMR-400 at 5 GHz: 0.12 dB/m.
• Connector losses: 0.1 dB × 2 = 0.2 dB.
• Total: (0.12 × 10) + 0.2 = 1.4 dB (~25% of the signal).

If the total losses exceed 3 dB, it is worth considering:

• 🔄 Replacement of the cable with a low-loss one (for example, H-155 instead of RG-213).
• 📶 Installation of the amplifier (LNA) next to the antenna.
• 🔌 Reducing the number of connectors (for example, soldering instead of adapters).

⚠️ Attention: Many online cable loss calculators do not take into account temperature conditionsIn cold weather, attenuation may increase by 10-15%, and when heated higher +50°C - on 5-10%For outdoor installation, choose a cable with a reserve in terms of characteristics.

FAQ: Frequently Asked Questions about Wi-Fi Antenna Cables

Can I use RG-6 TV cable for a Wi-Fi antenna?

No, it is absolutely not recommended. RG-6 has a wave resistance 75 Ohm, while Wi-Fi equipment is designed for 50 OhmThis will lead to signal reflection and losses up to 3-5 dB (up to 70% of power). In addition, RG-6 not optimized for high frequencies and has strong attenuation at 2.4/5 GHz.

Which cable is better: LMR-400 or H-155?

Depends on the task:

• LMR-400 cheaper and more flexible, suitable for lengths up to 20-30 m on 5 GHz.
• H-155 has lower attenuation (~0.1 dB/m at 5 GHz) and is better shielded, but is more expensive. Optimal for routes 30-50 m.

For home use it is usually enough LMR-400, for professional networks (eg, Ubiquiti or MikroTik) it's better to take H-155.

Do the connectors need to be soldered or can they be crimped?

Soldering is always more reliable than crimping, as it provides better contact and lower losses (~0.1 dB vs. ~0.3 dB). However, for temporary connections or if you have no soldering experience, you can use crimp connectors (e.g., SMA-crimp). The main thing is to check the quality of the connection with a tester or by signal stability.

⚠️ If you are crimping a connector, use special tool (crimper), not pliers - otherwise the contact will be unreliable.

How to protect cable from lightning?

For outdoor antennas, be sure to install lightning protection (For example, gas discharge tube or varistor) between the antenna and the cable. Also:

• Use a cable with metal braid (not foil!).
• Ground the cable shield through N-type connector.
• Avoid laying cables on metal structures (e.g. drainpipes).

Even if lightning strikes not the antenna, but nearby, the induced current can burn out the router port.

Is it possible to connect two cables together?

It is possible, but each adapter or connector adds 0.2-0.5 dB losses. If this cannot be avoided:

• Use sealed connectors (For example, N-type barrel).
• Minimize the number of connections (preferably one cable of the required length).
• Check the contact with a multimeter - the resistance should be close to 0 Ohm.

For outdoor use, it is better to solder the cables directly and insulate the connection point with heat shrink tubing.