Never owned a BUD, but knew a couple guys who did over the years...
One of the most fun aspects of those things was seeing things not meant for broadcast. If you tuned into a live news remote, chances are the feed was hot on a constant basis, even though the reporter might only be actually doing brief reports every few minutes. In-between, you could see what was happening in the background, hear the techies and talent discussing things (both related to the live shot and, more often, not) or, if you were lucky, catch a vain reporter having a hissy fit over something. This held for both local and network news shows; one dish owner told me that he had seen live feeds of quite a few Jane Pauley remotes during
Today, and said that while she was all sweetness and light on-air, she was quite the potty-mouthed bi*ch when off...
Likewise the live feeds of things like
The Tonight Show. As the show was fed live to NY for taping, the commercials had not yet been added, so whenever Johnny said "we'll be right back," viewers of the not-for-broadcast feed got to watch the activity in the studio during the "break." It's said that Carson often did "bluer" material for the studio audience during those breaks that he could not have done on the air. I've also heard that, eventually, Johnny caught on to the fact that there were some dish owners who were watching the live feed of the show, and would jokingly reference them in the breaks.
Similarly, backfeeds of live sporting events such as football games had hot cams and mikes during what normal viewers saw as commercial breaks (the spots being fed from the network, not from the remote unit at whatever stadium the game was being played). At first, the announcers were oblivious to the fact that a handful of "normal" people were able to listen in, and there were quite a few incidents of announcers saying dirty or embarrassing things during the breaks. Then the networks got wise and muted the audio on the live feed during the breaks, spoiling the fun.