My guess is that they are antennas related to the Palo Alto airport which is right next door. Being in a circular pattern points to VOR, though I could not loc

My guess is that they are antennas related to the Palo Alto airport which is right next door. Being in a circular pattern points to VOR, though I could not locate any database, either VOR or AM/FM broadcast that would list that location. The Palo Alto airport information [1] says: "+100 FT TRANSMISSION TWRS E OF ARPT". [1] https://www.airnav.com/airport/kpao https://www.airnav.com/airport/kpao