I would go with the discone for general listening, then if you got hot into monitoring one service, put up a special antenna for that. For example a 6 meter ham beam, 2 meter ham, or FM broadcast antenna. I even built up a stack of home brew beams for the NOAA weather stations on 162mhz. KILLER! :^) No reason you couldn't do the same for rail, air, lowband VHF, satellite, what have you. I also swapped out the 10.7mhz ceramic IF filter (~320khz) for a narrower Murata 110khz job and hooked it up to some Weingard 6065p antennas on the roof. Again, KILLER! The R7100 makes a nice DX rig for FM broadcast if you fix the wide bandwidth that it ships with. Enjoy!
You're getting a little over my head with some of your terminology. I don't know yet what some of those bands are and what frequencies they cover. I've got to do a little research before getting that far along. Thanks for the information.