By way of my first post here, I have a similar problem with my AR-108. In scan mode, the silly thing will absolutely not stop on an active frequency. Not in any of the three bands: VHF, Air, or Memory scan. I can manually stop and select an active frequency, and it receives it just fine (surprisingly well, actually). But it will not stop on an active freq in scan mode. Kinda defeats the purpose of being a scanner.
I have tried several different antennas, squelch settings, but still no joy.
Unfortunately, I picked it up passing through YVR last year, so taking it back to the store is out. Any ideas? Can I get it repaired somewhere?