TV Coaxial Cable: 12 Useful Things You Can Do

Your TV coaxial cable can do far more than just connect an antenna or cable box to your television. You can repurpose it for over-the-air (OTA) TV, FM radio, internet networking, security cameras, and even as a temporary Ethernet backbone—all with the right adapters and a bit of know‑how.

What a Coaxial Cable Actually Does

A coaxial cable (coax) carries radio‑frequency (RF) signals between devices. It has a central copper conductor, a dielectric insulator, a metallic shield, and an outer jacket. That shield is what makes coax so good at carrying high‑frequency signals without interference—it blocks external noise and keeps the signal inside.

Most homes have RG‑6 or RG‑59 coax. RG‑6 is thicker, has better shielding, and is standard for modern TV and internet. RG‑59 is thinner and often used for older analog CCTV or short runs. Knowing which one you have matters because RG‑59 can’t handle high‑frequency signals as well over long distances.

1. Connect an Over‑the‑Air Antenna

The most obvious use: plug a digital TV antenna into the coax port on your TV and scan for channels. You’ll get local broadcast networks (ABC, CBS, NBC, Fox, PBS) in many areas for free. The coax carries the RF signal from the antenna to the tuner inside your TV.

If your antenna is in the attic or on the roof, the coax run from the antenna to your TV is the same cable that was used for cable TV. You can simply disconnect the cable company’s line and attach your antenna’s coax to the existing wall outlet. Just make sure the cable is RG‑6 and not damaged.

2. Distribute TV Signals to Multiple Rooms

With a simple coax splitter, you can send one antenna signal to several TVs. A 2‑way splitter divides the signal between two outputs, a 4‑way between four, and so on. Each split adds about 3.5 dB of loss, so the signal gets weaker with every split. If your antenna signal is already marginal, you may need a preamplifier (a small amp that boosts the signal before it hits the splitter).

Example: If you have a strong antenna signal (–40 dBm at the wall), a 4‑way splitter will drop it to about –47 dBm. Most TVs can handle that, but if you’re in a fringe area you might see pixelation.

3. Listen to FM Radio

Your coax can also feed an FM radio. Many stereo receivers and some standalone tuners have a 75‑ohm coax input for FM. If you have an outdoor TV antenna, it likely picks up FM signals too—the FM band (88–108 MHz) sits just below TV channel 6. You can connect the coax from the antenna to your receiver’s FM antenna input and get clear, static‑free radio.

If you don’t have an antenna, you can make a simple dipole from a length of coax: strip the end, spread the shield and center conductor into a “T” shape, and connect it to the FM input. It won’t be as good as a dedicated FM antenna, but it works in urban areas.

4. Use It for a Security Camera (CCTV)

Older analog security cameras use coax to send video signals to a DVR. If you have a coax run to a spot where you want a camera, you can use it—provided the camera is analog (or uses a hybrid system). Many modern IP cameras use Ethernet, but there are “over coax” adapters (like EoC, Ethernet over Coax) that let you send IP video over existing coax runs.

For a simple setup, you can connect an analog camera to a DVR using the coax, and power the camera separately with a 12V adapter. The coax carries only the video signal. If you’re using a modern IP camera, you’ll need a converter at both ends to turn Ethernet into coax and back.

5. Create a MoCA Network (Ethernet over Coax)

MoCA (Multimedia over Coax Alliance) technology lets you turn your coax wiring into a high‑speed Ethernet network. You plug a MoCA adapter into a coax wall outlet near your router, and another adapter near your computer or smart TV. The adapters talk to each other over the coax, giving you wired‑like speeds (up to 1 Gbps with MoCA 2.5).

This is perfect if your Wi‑Fi doesn’t reach a room, but you have a coax outlet there. You just connect the adapter to the coax, plug an Ethernet cable from the adapter to your device, and you’re online. No new wiring needed.

6. Build a DIY Dipole Antenna for a Scanner or Ham Radio

If you’re into scanning or amateur radio, a length of coax can be turned into a simple antenna. For VHF/UHF (like police, fire, or weather radio), you can make a quarter‑wave ground plane or a dipole. The coax’s center conductor becomes one element, and the shield becomes the other.

Example: For 2 meters (144 MHz), a quarter‑wave is about 19.5 inches (49.5 cm). You’d cut the coax so that the center conductor is 19.5 inches long and the shield is also 19.5 inches, then spread them at 90 degrees. Connect the other end to your scanner. It’s not a high‑gain antenna, but it works for local signals.

7. Use It as a Temporary Ethernet Cable (With Baluns)

You can send Ethernet over coax using a pair of “baluns” (balanced‑unbalanced transformers). These small devices convert the 100‑ohm balanced signal of Ethernet to the 75‑ohm unbalanced signal of coax. Plug one balun into your router’s Ethernet port and the coax wall jack, then another balun at the far end. This gives you a 10/100 Mbps Ethernet link over distances up to about 100 meters (328 feet).

It’s not gigabit, but it’s fine for internet browsing or streaming SD video. It’s a great way to get a wired connection to a remote room without running new cable.

8. Extend a Wi‑Fi Antenna

Some routers and Wi‑Fi adapters have external antennas with a connector (like RP‑SMA). You can use a short piece of coax to relocate the antenna away from the router, improving placement. For example, if your router is in a cabinet, you can mount the antenna on the wall or near a window.

You’ll need a pigtail adapter that goes from the router’s antenna connector to a coax jack (like F‑type or BNC). Then connect a length of coax to a remote antenna. Keep the run under 10 feet (3 meters) to avoid signal loss.

9. Make a Simple Signal Meter

If you’re aiming an antenna, you can use a cheap coax signal meter (a small device that shows signal strength in dB). Connect the antenna coax to the meter’s input, and the meter to your TV. Then rotate the antenna and watch the meter. It’s much easier than running back and forth to the TV’s menu.

Some meters are passive (no power) and just show relative strength; others are amplified and more accurate. Either way, you’re using the coax to carry the signal to the meter.

10. Use It for a Ham Radio Base Station

If you have a ham radio transceiver, you need a good antenna feed line. Coax is the standard. RG‑8X or RG‑213 are common, but if you have RG‑6 laying around, you can use it for receiving (not transmitting) on HF/VHF. For transmitting, you need the right impedance (50 ohms for ham, 75 ohms for TV). Using 75‑ohm coax will cause a slight mismatch, but for short runs and low power it’s often acceptable.

If you’re a licensed ham, you can connect your radio to a dipole antenna using the coax. Just be aware that 75‑ohm coax has more loss than 50‑ohm at VHF/UHF, so keep runs short.

11. Create a Weather Station Sensor Link

Some home weather stations use a wired connection between the outdoor sensor array and the indoor console. If the included cable is too short, you can extend it with coax and a couple of RJ‑11 or RJ‑22 connectors. The sensor signals are low‑frequency, so coax works fine, and the shielding helps prevent interference.

You’ll need to solder or crimp the connectors, but it’s a straightforward job. Just make sure the polarity matches.

12. Donate It or Recycle It

If you have a lot of coax and no use for it, consider donating it to a school or a makerspace. Many robotics teams use coax for antenna projects. Or, recycle it at an electronics recycling center—the copper inside is valuable and can be reclaimed.

Frequently Asked Questions

Can I use coax for internet?

Yes, with MoCA adapters or a cable modem. A cable modem uses the same coax that brings cable TV into your home, but it carries data instead of video. MoCA adapters let you use existing coax for a home network.

Is RG‑6 better than RG‑59?

For TV and internet, yes. RG‑6 has lower signal loss at high frequencies and better shielding. RG‑59 is fine for short analog video runs (under 50 feet) but not recommended for modern TV or data.

Can I use a coax splitter for internet?

Yes, but it will reduce signal strength. For cable internet, you need a splitter rated for the frequency range (5–1000 MHz or higher). Too many splits can cause dropouts.

How do I know if my coax is live?

If you have cable TV or internet, the coax is likely live. You can test it with a multimeter (check for voltage) or simply plug in a TV and scan for channels. If you get nothing, it might be disconnected at the street or damaged.

Can I use coax for a speaker wire?

No, coax is not suitable for speaker wire. Speaker wire needs to carry high current at low voltage, and coax’s thin center conductor would overheat. Use proper speaker wire.

Is it safe to cut coax?

Yes, but be careful: the center conductor carries RF signals, not dangerous voltage. However, if the coax is connected to a cable modem or antenna, there could be a small DC voltage (around 5–15V) on the line. Use insulated tools and turn off any connected equipment.

Related

• GST Rate Changes on Advance Payments & Pending Orders
• Why Blockchain Transactions Are Hard to Reverse Once Signed
• Chromecast 4K Support: What It Means & How to Get It