OT Zap2it changes with the times?

OT Zap2it changes with the times?
I used to use Zap2it TV listings a lot. They have a setting for each cable or satellite company that operates here and a setting for Antenna, which is what I use. But when I got a better antenna and an antenna amp, and I could get DC stations, it was a problem because the listing I was using only gave Batlimore stations. No easy way to have it remember 2 zipcodes at the same time, so I got a zipcode map and tried zipcodes half way between Balt. and Washington. I thought I'd only have to try one, but the first 4 didn't work. One didn't have Balt. or DC iirc But I found one and used it for a year or two.
Well, I don't remember what it was, but this time when I put my Baltimore zipcode in, it has all the DC stations too.
I wonder how that happened. Was there a wave of people getting better antennas? Or did they do it just for me?
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