I almost always have my Garmin 295 on the glareshield, works perfectly, although signal strength is about 1/2 when not recieving thru the B737-300/400 windscreens.
King KX99 transciever has also been used when we had total radio failure about 5 years ago on a B727-200, reception very good, transmission range limited....acknowledged all ATC instructions with "squawk Ident" as well as transmissions, stayed within 25NM of the field and never lost communications.