In the United States and Canada, all channel 6 VHF stations broadcast an aural signal on 87.76 FM...that is what you hear when you tune to 87.7 FM in the NYC area. Before this station signed on, it was often possible to hear the audio signal of Philadelphia's ABC affiliate, which is also on Channel 6, on 87.7 FM, quite often in the NYC region.
As for LPTV's, they're signing on all over the country...and they're just that, low-power TV stations. Unfortunately, most of the LPTV's in NYC belong to one owner and show much of the same programming (infomercials, paid programming, and a couple of locally produced shows plus syndicated ethnic fare), but LPTV's can be used for community-oriented programming too.
LPTV's in NYC: 6, 17 (Korean), 26, 32 (HSN), 34 (rebroadcasts Pax TV, I think it's actually from NJ), 35, 36 (somewhere in NJ), 39 (Azteca America affiliate), 49, 60 (this one's been on for many many years, rebroadcasting America's Store).
> How does this work. How is it they are on both TV and
> Radio? I don't really understand the LPTV thing. Can
> somebody explain, and is it possible to make in other
> city's?
>