Total posts : 45366
KHMB in Half Moon Bay … is using a multi-hamilton rangemaster setup and getting exactly the range you are looking for.
Any of those Rangemasters using 1710 kHz as shown on his website would have much less legal coverage than is possible using an unlicensed system operating legally under FCC §15.219, though.
Also… transmitters on the same frequency and installed fairly close to each other need to have their operating frequencies exactly locked together, as well as having their program audio correctly synced in timing and modulation polarity. Even then there may be areas where they interfere with each other.
Not such good news for dcramer16, I know (sorry).