You're probably already aware, but hams use the same dual band antennas all the time for 2m, MURS, 70cm and GMRS. Along the same lines that berkinet posted, when they want one primarily for 70cm, they buy or make one centered more towards that band. Likewise if they want to primarily use GMRS.
*** To those reading... I am not advocating violation of FCC rules on this forum. It is an observation of what has been commonly practiced in my area. That does not make it legally correct. Radio type acceptance must match the service being used to be legal. ***
I got unexpectedly busy this afternoon and evening. I have a moment to post.
RE: M1225
The USB cable plugs into the microphone port on the front.
AFAIK, the CPS version depends on the software version of the radio.
I am not sure there is a 64 bit version of the CPS but, again, I believe the CPS version used depends on the firmware/software/last CPS used on the radio. All I've used is a 16/32 bit version.
Our M1225 radios all program up with the BlueMax49ers USB to RJ-45 cable and the CPS we got with our first used M1225.
Our software runs on Windows XP. The machine is not handy at the moment so I cannot find the CPS version yet.
In the past, CPS for the radio was available through Motorola's software system under discontinued radios. The account was free and the software was free.
Of course, there are other sources for the software. (That's far enough to post here, I think.)
Hans's post in Hypothetical question of UHF antenna bandwidth. was marked as the answer