exactly what I was thinking the other day. Loudoun VA's trunked system has about 5 or so sites.Well you cant have a great radio system with one tower for the whole county, it aint gonna work, no matter what kind of system you have, if you build more towers you will have a better radio system. Oh and one tower high up on a mountain doesnt cut it either.
They can have a number of configurations for towers, 3 towers one in the middle, one in Washington County directed back towards the North end of the county and one is Virginia covering the South end or they can have four towers one in each corner (which would be overkill I think) any number of combinations would be better than that one tower.
I was in Shepherds Town this past week and could not pick up the system on a portable, but once connected to an outside antenna I had maybe 3-4 bars on my 396 and it wasnt solid all of the time.