Bob Miller wrote:

At the bottom of the sunspot cycle, you won't hear much in the way of
international broadcasts of anything in this range.

During the summertime you may occasionally hear ham band openings in
the low 50 mhz range. I've heard the California Highway Patrol is
still around 42 mhz, but that may be rumor; that'd take a pretty big
whip antenna. Around 56 mhz and up you'll hear TV stations, channel 2
and up.

Here are a few apparently still in use:

California Highway Patrol
{CHP}
("56" = West Valley Office)
-base teal 42.3600 WPAE678 CTCSS 192.8
-mobile teal 42.7800 WPAE678 CTCSS 192.8

("78" = Newhall Office)
("130" = Castaic Inspection Facility)
-repeater lime-4 39.9200 42.2800 WNFY237 CTCSS 136.5
-base (old) tan 42.4200 WNFY237 CTCSS 192.8
-mobile (old) tan 42.8400 WNFY237 CTCSS 192.8

("98" = Altadena Office)
-base brown 42.5000 KJP457 CTCSS 192.8
-mobile brown 42.8200 KJP457 CTCSS 192.8

Info from : http://www.n6lhv.net/valleyscan.html#federal

A pretty lengthy listing there, for the Greater San Fernando Valley.