Total posts : 45366
The whole idea of the TH with the ATU is to keep the TH indoors. It isn’t exactly the ideal transmitter otherwise. Both the ProCaster and the Rangemaster do better jobs all around, both in terms of allowing asymmetric modulation and sonically.
I’d just keep the TH unit indoors – much easier.
I don’t think you’re going to get much loss over the coax, in any event, particularly with the relatively short lengths involved and the frequencies you’re operating at.