For each station shown there are 3-4 substations.
Good. I'll let my rabbits know.
That would be rabbitears.info.
Anyway, I didn't see a LOT of channels. Maybe a dozen and a half in the DC direction, and the field strength was bad for almost all of them, for my location. I'm thinking this is still not going to be worth experimenting with.
Have you tried locast? For $5 a month you can get a ton of stations, all DC stations.