The water tower in the background is about 1/2 block away and is twice as tall as the tower I'm on. When I've got some extra money I'll try to get onto it (gotta run power etc. to it). At this point it doesn't seem to be having an affect on things. The antenna on the top is a Mobile Mark 9db omni. It's since been changes out with a Teletronics 180* antenna. The swap had no affect on the customer that's having trouble with multipath so I think that mostly rules out the water tower as the cause of the trouble.