> The distance I came up with was between point "A" and point
> "B", or the tower sites of the two stations, according to
> the FCC database.
>
> By the way, Lancaster is to the SOUTHEAST of Harrisburg.
>
> As for WNPA-TV channel 19 being moved into the Pittsburgh, I
> had heard of that. It became their UPN station. Now, is
> there a reason why the station is licensed to Jeanette, PA
> and not Pittsburgh?
>
WNPA Channel 19 (formerly WFAT and WBPA) used to be in the Jownstown/Altoona Market. After the station lost a major network affiliation in that market, they moved to Jeanette to be in the Pittsburgh Market as in independent, or UPN.
It was not possible for the station, WNPA, to get its city of license into Pittsburgh, since Pittsburgh already has several licenses. However, the loophole, of course, is just use a suburb that is within the DMA, and use the must-carry rules to demand cable companies to carry the station, whether the station has relevance or not.
In Philadelphia, Univision can't change WUVP's city of license to Philadelphia, nor can Pax change WPPX's city of license to Philadelphia; Pittsburgh, like Philadelphia, can't gain any peripheral stations to be licensed into the city.
Your right Lancaster is east of Harrisburg. But WGAL broadcasts 17 miles west of Lancaster, so somewhere central to Harrisburg, Lebanon, Lancaster and York.
If they had a tower in Lancaster city itself, lot more people in eastern PA would be in the fringe of WGAL's signal. But, that would cause detraction to KYW and now WCAU, when WGAL isn't supposed to serve the Philly suburbs.
They reach Berks County, but don't penetrate much else within the Philadelphia market. And, WGAL doesn't do Berks news. But, Comcast Reading carries them by mustcarry. In Reading, Lancaster is closer than Philadelphia. Mustcarry, when it comes to duplicating networks, depends upon city of license, not tower location. Comcast can't drop WGAL there, in favor of CN8, as long as Hearst requests WGAL to be kept on the cable dial. Comcast can't drop WCAU, as WCAU NBC has a retransmission agreement with Comcast for the entire DMA, and Berks is in the Philly DMA, so Comcast Reading mustcarry both.
Does anyone know, did WGAL once broadcast more east, closer to Philly? The Phila. Inquirer for a long time used to give listings for WGAL and WLYH, NBC8 and CBS15. I wonder if back long ago, if more viewers in the Philadelphia suburbs, besides Berks County residents, could receive WGAL, over the air. Otherwise, the Inquirer was being quite generous giving listings for these out of market stations, that only residents in Berks (a quite far away county) could see. I remember the Inquirer, awhile back for a short period, maybe for only NJ subscribers had the NY VHF stations (including 2, 4, 5 and 7). But it really only would make sense for customers in Trenton and Mercer County, but I doubt Mercer County has a high number of subscribers to the Inquirer, to begin with.