# 4g transmit from a tv antenna to an indoor antenna

We have a TV antenna on the roof, works on 5-2600 MHz. Its cable runs from roof to my room, connected to the TV.

I am wondering if I could transmit 4g signal using another antenna, by connecting a splitter to the cable inside the house one end of the splitter to the TV and one to an antenna.

will this work?

by another antenna means, a simple bipole 2.4ghz antenna, can be as simple as a diy bipole antenne

• the description in your question is unclear .... what is another antenna? – jsotola Nov 27 '18 at 7:54
• For clarity, include a drawing of the setup you propose. – Bimpelrekkie Nov 27 '18 at 8:10
• question updates – Joey Hipolito Nov 27 '18 at 9:13
• Beware that it is likely illegal to transmit or retransmit on bands which you do not have a license for - and 4G bands will be some of those. – SomeoneSomewhereSupportsMonica Nov 27 '18 at 9:57

## 2 Answers

I assume you mean transmitting both signals (4G and TV) over one cable. This will lead to interference and should not be possible. The frequency band from 4G goes according to Wikipedia up to 3500 MHz and as low as 703 MHz (Not sure if this applicable for common phone 4G in your country). So the same Antenna wouldn't work anyway. Additionally I doubt that the 4G Receiver and the TV Receiver as well as two antennas have the same impedance and therefore won't be matched. Not sure if I remember this correct, but TV antennas are often matched with 300 Ohm impedance. Telecommunication antennas often use 75 or 50 Ohms (Google it, not sure anymore)

You'd had to do some serious signal processing, than you would be able use one cable to transmit both simultaneously. The fact that there are different frequency bands for Up- and Downlink makes it even trickier.

• i see., it's indeed trickier than i thought, though our 4g frequency is on 700, 900, 1600, 2100, 2600.. so it should support, but the impedence may be the determining factor – Joey Hipolito Nov 27 '18 at 9:50
• @JoeyHipolito well if you use them same antenna it will at least be matched on the antenna site... However you would still need something on the other end of the cable besides the TV receiver to transmit the 4G in your room. But thats theoretical. The frequency bands overlap and therefore there will be interferences. – Mr.Sh4nnon Nov 27 '18 at 9:54

It does work. Getting 15Mbps on a TV antenna mounted to the roof. And around 4-5Mbps on the other two I have access to in my flat that's also roof mounted.

I suspect the other two have the LTE filter as while it does restrict, it doesn't block entirely so some signal can still get through. The signal strength isn't improved though compared to using a 4g antenna, and you won't get higher frequencies that they support. But if there's obstructions and you just want less lag but fine with slower speeds then a 4g antenna provides then give it a try. The adapters to use the coax cables in a 4g router are on amazon for example, though you'd need to use the cable directly without anything to secure it in place if the cable doesn't fit in the adapter you get. That'd at least be good enough for testing purposes though. And only requires unscrewing the end of the coax cable to expose the bare copper cable and plugging that into the hole directly in the adapter.

And don't ask me about if you'd need a TV license or not to use TV antennas like this because I honestly have no idea. So I don't use them myself, I only tested it out of curiosity. My 4g antenna doubles the speeds I get.