Telerity encoded is a PBS MPEG-4 signal often transmitted on 12095, ie fairly close to 12104 that Montanna is on, so if you're using blind search, you may come up with one or the other, or if your LNB is off freq a bit, same thing. It has pretty much the same SR as Montanna.
This 12095 transponder seems to change from one format to another to another, so it's not always the same content. When it comes up Telerity though, it almost always is in MPEG4 mode, so not all receivers will display the video. It's pretty amazing though that they put up a HD MPEG4 video in that 4340 SR, although it's very low quality.
A while back, I googled Telerity, and they are a company specializing in MPEG4, and one of their main contracts is with a southeast state (alabama or something) that is trying to distribute PBS signals around their state with a minimum of bandwidth. I really hope this isn't the future of PBS.