pbs not listed in 31410

[gargiulo31410]

Hello
I was wondering why my local PBS transmitter would not be listed when I use the Geoselector. I live in 31410, and the transmitter is about 45 miles away in Pembroke, GA, 31312.
Station's website: http://www.gpb.org/television/stations/wvan
PBS coverage map: http://www.gpb.org/television/stations
The landscape around here is very flat.
Right now I only have a cheap indoor antenna, and it's doing a good job getting all the other stations listed. The signal for those could be better. But PBS is what I care about. I don't want to invest in a better antenna, though, if there's some reason why the PBS station (WVAN) is not listed and no antenna would pick it up.
Thanks for any help!
Mike

[gargiulo31410]

Just to be clear, I'm not asking for advice about the indoor antenna, just wanting to check if an outdoor antenna would make any difference for that particular PBS channel.