I've had success with extension of a Pronto's RF range by making a passive extender. You put a pickup antenna on one end of a piece of cable and a transmit antenna on the other end. The antennas are the same.
Cut about a 10" piece of RG6. Strip back and expose about 7" of bare center conductor. Put an F connector on the other end. This is a quarter wave stupid inefficient antenna that will help you a lot. Now make another one.
Put one of these on each end of that spare RG6, with the one nearest to the RP-1 really near to its antenna -- maybe a foot or less from it. The other end is to be in the area where the remote will be used.
When a Pronto would not go the whole sixty feet of a spec house in Malibu, I did this with the remote antenna behind drywall near a plasma. The remote then had about eighty feet of coverage.
In another location I plugged the pickup antenna into a 10 dB amp for even better range.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
