This is just a thought but you said that you are surrounded by giant trees, what about putting up a stealth antenna in those trees if possible. It would let you get it up higher as well as hide that it is there from your HOA.
Do you know how many feed providers there are on here? I don't but I can guarantee that there are so many that it is impossible for all the administrators to monitor them all. Plus they have other things to do (like jobs) then monitor feeds looking for violators. That is why there is a way...
I got interested in radios back as a freshman in high school. My physical science teacher has an amateur radio in the class room. Now public safety, my wife convinced me to join a local volunteer department.
Yahoo basically did away with their groups. If I remember correctly, you can email the group admin and they can put you on their mailing list. Only other thing I can think of it to try Google groups and see if it is in there.
That is an interesting idea. Since the protesters seem to be listening to police communications via scanners and relaying information to others, the idea to listen to the protesters communications and relay that information to other officers.