hello,from my experience (i live in fremont) ive come to find out they only use the omaha tower when they're in omaha or very near, when they're in fremont they use the mead and tekameh towers about equally, (if i had to choose 1 i would say the use the mead tower more) and when they talk to each other its ALWAYS on 42.040
with a handheld antenna i wouldnt expect to hear them from more then a mile (TOPS) away, with the antenex c40 low band antenna (tuned specifically to 42mhz) i can hear the units from about 15-20 miles away, and all 3 dispatch towers clearly