N_Jay said:
"Static" on FM systems is most likely due to low signal level that to high noise (real static).
Your path loss is lower at night (Obviously).
The path loss is lower at night? On average, I've never noticed that signals were STRONGER at night. Maybe they were more CLEAR due to lower noise, but never stronger. Anything I've heard at night, I can hear during the day.
Of course, tropo ducting and the like aside, but that can happen any time of day.
Joe M.