AMSAT - Satellite Status
Check the sat status page. HO-68 is only on for certain passes and switches between FM/Packet and linear transponder modes.
CAMSAT
AO-51 is currently not running the FM(V/U) repeater.
AMSAT - AO-51 Control Team News
Looks like it will switch back to V/U mode late Nov 22.
I could never hear SO-50 with my VX-6 with the yaesu rubber duck but can pick it up with my diamond rubber duck from inside my car.
AO-27, this sat is only on for ascending passes over NA for 7 minutes. It turns on about the time it crosses the 30 degrees north latitude and shuts off before crossing 60 degrees.
Official AO-27 HomePage
You can download the next events for 24 hours on this page or you can download the AO-27 scheduler that will let you put in the date and it will predict what times the sat will be on in analogue(repeater) mode.
The arrow 2 or elk handheld antennas will make it easier to use any of the FM sats and there are some good videos on the arrow antenna page
Arrow Antenna's Arrow II Antennas
The video by moleculo shows a bit on what you have to do to pick up the sats with the rubber duck antenna- you almost have to be a contortionist at times and you may have to have a high elevation pass to make a contact