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