I have good results with a duel band 2m/440 antennas even on the 800 band, I use a larson NMO trunk lip mount, I couldn't tell you what the antenna is, however its approx 18", I have 2, one is silver with a little more give than the black one, I have a cell phone antenna that I tried and really didnt see that much difference in the trunked systems, which in my area is the motorola smartnet II, I also have a pmm3, and the ks3, I really cant tell the difference in any of these antennas. I can however say that the pmm3 antennas make a really good antenna for transmitting on 2M, stick it on a cake pan and Ive hit repeaters 50 miles away with an HT, I cant make that claim for the cell antenna of course, I guess what it boils down to it, its really what you want to spend and what you wanna listen to, its my belief that for general listening, theres not much that wont work.I have always used my Amateur Radio antennas on the scanner and 800MHz is the only band they're deaf on. That hole gets filled with an old cell phone antenna, the system has worked well for many years. Never mind all the technobabble, they work and that is that.