I am not sure if this is a good place to ask technical questions—e.g.: power required to transmit data over [x]km—about VHF antennas; or if electrical engineering would be a better stackexchange site to ask on.
Where do you think would be best to ask?
I believe it's a better fit for electrical engineering.
Another option would be the Amateur Radio site. The intent is to be focused mostly on "ham" topics but, as their site scope page explains, with some care most RF-related questions can be made relevant:
Promoting understanding and skill in radio operation is a core mission of the Amateur service, so if questions about such services can be framed to be about radio in general, then they may be asked here.
