Is RDS on FM not available out there? Here in the UK,
if you're listenning to one of the national FM stations and
have an RDS radio (virtually all car radios have RDS)it will
tune to the next transmitter as its signal exceeds that of the
previous one you were tuned to.

http://www.rds.org.uk/rds98/whatisrds.htm

DAB (digital audio broadcasting) will also do that, though
the receivers aren't that common at the moment.

http://www.drdb.org/

Paul

"CriticalMass" wrote in message
...
If you need a solution to the loss of capability to listen to AM radio, I
just read an interesting article on AvWeb about satellite radio, which
eliminates the need to keep tuning new stations on the ADF when you fly
out
of range of the stations.