What Is RG58 Coaxial Cable? Your Friendly Guide to the 50-Ohm Coax Cable for Antennas and TVs

 When setting up an antenna or radio system, one of the first things you’ll hear about is RG58 coaxial cable. But what exactly is it, and why do so many installers and radio enthusiasts still trust it in 2025?

Let’s break it down simply — so you can choose the right coax cable for your antenna or TV setup with confidence.

What Is a Coaxial Cable, Anyway?

A coaxial cable (or simply coax cable) is a special type of electrical cable designed to carry radio frequency (RF) signals with minimal interference. It has multiple layers:

  • A central copper conductor that carries the signal

  • An insulating layer

  • A metal shield (to block external noise)

  • And an outer jacket for protection

This layered structure keeps your signal strong and clean — perfect for radios, antennas, and even TV systems.

So, What Makes RG58 Coaxial Cable Special?

RG58 is one of the most widely used types of coaxial cable. It’s known for being 50 ohms, which makes it ideal for applications involving radio transmitters, Wi-Fi antennas, CB radios, and amateur (ham) radio setups.

Key RG58 Features:

  • Impedance: 50 ohms (for transmitting signals efficiently)

  • Flexibility: Easy to route and bend — great for tight installations

  • Compatibility: Works with a wide range of antenna connectors and equipment

  • Frequency range: Performs well up to about 1 GHz

If you’ve ever connected a radio or an antenna to your vehicle or base station, chances are you’ve used an RG58 coax cable.

RG58 vs Other Coaxial Cables: What’s the Difference?

You might wonder — why not use RG6 or RG59 instead?

Cable TypeImpedanceCommon UseNotes
RG5850 ohmRadios, antennas, CB systems    Ideal for transmitting signals
RG5975 ohmCCTV and video    Good for short distances
RG675 ohmTV and satellite    Great for longer runs, lower signal loss

If you’re setting up a TV antenna, a 75-ohm cable (like RG6) may be the right pick.
But if you’re connecting a radio antenna or transceiver, you’ll want the 50-ohm RG58 coax cable for best performance.

Is RG58 a Good Coax Cable for Antennas?

Absolutely. RG58 is a popular choice for antenna coaxial cable — especially in:

  • CB and HAM radio systems

  • Marine and vehicle antennas

  • Two-way radios

  • Wi-Fi antennas

Because it’s lightweight and flexible, it’s perfect for setups where you might need to move or adjust your antenna.

For high-power or long-distance runs, though, you might step up to a thicker cable like RG213. But for everyday use, RG58 coax cable delivers excellent balance between performance and convenience.

How to Choose the Right Coax Cable for Your Setup

Here’s a quick checklist before buying your next cable:

  1. Check impedance: 50 ohms for radios and antennas, 75 ohms for TVs.

  2. Consider length: The longer the cable, the more signal loss.

  3. Look at flexibility: RG58 is easier to install in vehicles or tight spaces.

  4. Check connector type: Common connectors include BNC, N-Type, and PL-259.

  5. Quality matters: Choose a trusted supplier to ensure consistent signal performance.


Where Can You Buy RG58 and Other Coaxial Cables in Australia?

If you’re in Australia and looking for high-quality RG58 coaxial cable, Comtek Radio is one of the most reliable sources.

You can explore:

They offer trusted brands, pre-terminated cable options, and accessories for both hobbyists and professionals.

Frequently Asked Questions

1. Is RG58 good for TV antennas?

It can work, but RG58 (50 ohm) is better suited for radio and communication equipment.
For TV antennas, a 75-ohm cable (like RG6) is recommended for clearer video signals.

2. Can RG58 be used outdoors?

Yes — just make sure to choose a UV-resistant jacket or run it through protective conduit. Outdoor-rated RG58 is perfect for marine and field use.

3. How far can I run RG58 cable without losing signal?

Generally, up to 20–30 metres is safe for most radio frequencies. Beyond that, you might experience some signal loss, so consider a thicker cable for longer distances.

4. What connectors work with RG58?

You’ll often see BNC, PL-259 (UHF), or N-Type connectors paired with RG58. These ensure solid, low-loss connections between your radio and antenna.

Final Thoughts: Choose the Right Coax, Get Clearer Signals

Whether you’re installing a CB radio, setting up an antenna system, or connecting your TV, using the correct coaxial cable makes all the difference.

If you want a reliable, flexible, and proven option, the RG58 50-ohm coaxial cable is a classic that continues to perform in modern setups.

👉 Check out Comtek Radio’s cable accessories for the latest options and expert advice.


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