There’s all kinds of electrical interference. Some stations are simulcasting on FM but many of these
are weak “FM translators”.
More often people are turning to
streaming audio at night.
In Boston iHeart’s WRKO, WBZ AM and
WXKS AM run conservative talk (WBZ, one show at night). All are available online
(can hear via Bluetooth in your car)
and all are also on HD radio HD2 channels
(need special radio, like one portable
Best Buy sells for $40)
Some cities do have powerful FMs
with conservative talk...as well as
powerful NPR affiliates.
That should just say ‘streaming audio
‘