Wouldn't go down that route myself as you have no idea of the threshold of the tuner (the amount of signal and esp the quality of signal that tuner needs to operate), they do vary considerably. You may think you have good enough quality signal when, in fact your mini tv has a very low threshold tuner and vice versa
Without test equipment you are very much in the dark and signal strength is increasingly less of an issue (in post switchover areas). You need to measure signal quality. If you have good quality you can pretty much ignore signal strength. My pvr shows signal strength around 35%, quality 100%
Probably the best way is to run your cables to a central distribution point where you will have an f type splitter, Connect it all up and see. If no joy, remove the splitter and connect just one leg to the aerial (with an f type barrel) and see how you get on. If still no joy then try a variable gain set back type amp just before your joint and see the results. If ok reconnect splitter and increase the gain on the amp a bit to compensate for splitter losses. If it is not ok then you will need an aerial installer who will determine if your aerial is in the best place and if it needs amplification (he would probably use a masthead in order to amplify the cleanest possible signal) and can then just connect into what you have provided.
Just to re-emphasise, in a post switchover area, strength is a lot less of an issue as it was in the analogue days. Obviously I do take note of the signal strength reading on my spectrum analyser but this is almost incidental as the main thing I am looking to measure is the signal quality.
