I’ve been testing a pair of 900mhz DTR550 radios around the Victoria area
and have found the range quite good. They penetrate dense wet trees reliably and operate over hills to a suprising degree. A nice feature is one radio may be left unattended while driving about with the other as they do a handshake to see if they are in range before allowing conversation. This makes it very easy to test the range.
I also did a very short test with a pair of European DTR2450 2.4G radios and they were very dissapointing. No ability to work over hills and any foliage
may have well been a brick wall. Places where the DTR550s were good were a no go at 2.4G.
By the way, I notice some other activity on 900mhz by other motorola DTRs
(Local hockey rink) on the default channel 1. Guess they were too lazy to pgm some private key channels.