Skurj has it right, not only can I surf in and listen to a bish or rooks squad comms. (Remember the MAW episode?) ANY 11 year old idiot can surf in and mess with you.
I had guys insulting my mother,swearing a blue streak at the drop of a hat. My first clue was when someone asked what game we were all playing. One real prettythang named circe was doing all kinds of fancy tricks, includeing apparently recording pieces of conversation then instantly playing them back repeatedly.
Hopefully HT can find a way to have all AH channels NOT show up on the server list.
Till then if you want secure uninterupted comms you better be joining a password protected base station channel.