Nick said:If there's e-skip, it affects half the country and you'll see a lot of reports here. If it's tropo, it doesn't affect as wide an area.
I am not sure that I agree with that statement.
I have seen many, many Es openings with very narrow footprints, often allowing maybe just one station in at a time. In fact, in the days I was DXing TV, my longest Es was Southern Mississippi to San Francisco. That event was odd -- it was JUST KTVU, all by itself on channel 2. No Denver, no North Platte, no Vermillion, SD, or any of the other stations between it and me one might expect.
Conversely, I have witnessed tropo openings that were long-lasting and covered a huge amount of real estate. April, 2006 comes to mind. In that four-day opening, tropo was saturating from deep into Texas, across the Gulf, reaching into the Cumberland Plateau and going as far east as South Florida and Georgia. And, it was really, really intense. TV and FM radio stations were having interference in their local coverage areas all across the region.
Ultimately, once you have seen a few openings, you'll have NO trouble discerning between Es and tropo.
DE