Sometimes I see things that make me go hmm and then dig through FCC licenses. Cleanscapes was one of these. I found
a license and threw all the freqs in the scanner for a day (which is where
this came from). No traffic after two weekdays.
Had a chance today to take a closer look at one of the trucks. The roof of the cab looks like a page out of
an antenna catalog (I counted four) and the driver had a touchscreen that he poked after making a pickup. I didn't see anything that looked like a microphone.
So just in case someone else has the same thought I did--don't bother plugging in those freqs unless you're in Pioneer Square.