Once the aerial is in place the aerial cable needs to be connected to the signal booster.
The booster requires a 12v supply to work so “piggy backing” the wires off a nearby 12v socket is the most common way of powering it. Make sure the power turns off when the main caravan control panel turns off and that the fuse rating is around 5amp.
Once that is done you then need to run a “coax” cable from the booster to your TV point or just run direct to your TV. Its worth looking round behind trims as most manufactures pre-run the coax and sometimes a 12v supply to connect to, making installation quicker.