I should have added that the part about "very narrow pattern" implies "very
big antenna". Pattern is dependent on antenna size. The narrower the
pattern, the bigger antenna required to get the proper phase relationships
to form the pattern.
Steve

"Steve Nosko" wrote in message
...
Single frequency repeaters have been used, but the wide bandwidth here can
be a problem. In some situations two antennas is all that is needed -
probably not here, but inside a car, for example. The next step is just
two
antennas with amplification. I have used this in a conference room for
analog cellular - two tuplexers and two amplifiers for the Tx & Rx bands.

Using gain antennas back to back (high FB) and controlled gain in the
repeater, it has be done at VHF FM. If the destination can possibly hear
both the original and repeated signals, then it also needs to be
coherent -
that is:... receive - mix down, amplify, mix back up to freq.
The poster should provide more information on just what is desired.
There
are things called "community Repeaters" which have been used for towns in
a
valley to receive TV & FM broadcase.

--
Steve N, K,9;d, c. i My email has no u's.