You don’t have an aerial by the sound of it …check if there is a cable connected to the aerial input on the booster , it’s quite normal on new builds for the internall cables to be installed but not the tv aerial…
Those brackets will only be any good as long as you can mount the camera at 90 degree to the viewing angle ….and only good if your mounting the camera internally ….
Ok for a an example….you had a cat 5 cables in your house 1 point per room …x10 that all ran to a common point that hadn’t been labelled up …you clip on the tone generator at room 1 , go to the set of 10 cables , run the probe done each of the ten cables one of these should give you a tone …...