"David" wrote in message
...
950 mHz Aural STLs can go a lot farther than 40 miles.

With US power limits, you can get pretty dicey even at 35 miles and up; I
have worked on a 50 mile one in Puerto Rico, and we had to put up two
antennas about 60 feet apart on the receiving tower and use diversity
reception to overcome variances in the arrival of the signal. A classic is
740-AM in LA, with studios in LA and transmitter on Santa Catalina Island.
The over-the water propagation varies so that a single receiving antenna
will loose the signal often. This was written up in the 70's in one of the
engineering magazines.