I did a spectrum analysts about 6 years ago on top of SMT and found it in usable in downtown for anything wideband. Wanted to use the Motorola Canopy device at the time.
FYI
A few years back (~6) we hooked a spectrum analyser up to a tower mounted yagi pointed at Federal Way from the Gold Mountain DNR site and it was surprisingly quiet. We were trying to establish a 22 mile digital link between the site (WD7STR -- now off air) and a residence in Federal Way on 900 Mhz but it was not reliable with the equipment in place.--