Horizontal is used a lot for HF where you get skip but I doubt it would be useful for UHF. Especially since you will loose some because of the change in polarization.
On our ham net last night it was announced that there is a new GMRS repeater in the area. That's another way to let people know in a "non-intrusive" way.
@WSEM624 I would wish you luck but I know you don't need luck. You'll do just fine.
BTW, it two-way-radios it's called "transmitting" not "broadcasting"
</end sad-ham rant>
They may be on a repeater or just using tones simplex. Read up on repeaters and tones.
It's called Chinglesh and by the time you learn it you will already be an expert on your radio.
@quarterwave Unfortunately "sad hams" do exist. I wish it weren't so, and I've been lucky not to encounter them myself yet, but I'm aware that they do exist.