KGOW was booming into Northern IL last night around 6 p.m. (their local sign-off time is 5:30 for December), so they were on with their day pattern a while after their local sign off time... WQEW New York - Radio Disney was coming in very well last night and giving KGOW quite some signal competition (kinda rare these days for WQEW to have a strong, steady signal with the usual jumble of signals on 1560)
MIght as well change the name, because it is no longer about WBAP. KGOW ran full daytime power at night right after hurricane Ike - it is possible they like that coverage and are sneaking daytime power on at night. Of course, the IBOC people will tell you there is no skywave listeners, so there is no motivation for KGOW to leave its daytime power on!
Their regular format is of no interest to me, but when I lived in Plano, their daytime coverage was interesting. It would either boom in almost like a local, or be completely absent. It is obviouly high enough in frequency you are getting that shortwave effect. I imagine that the Radio Mickey people in OKC have problems on occasion with it, because that much power and a little atmospherics should carry it to OKC almost as well.
Quite a difference 40 kHz makes - I have had no reception of KOKC day here, of course KYND is here in the day. But still --- you would think KOKC should bounce in once in a while. Same, too with KZMP, although they throw quite a null towards Houston - just to protect KGBC?

But they do. No trace of them in Houston, KGBC dominates the frequency.
X-band Houston is very interesting, especially 1680 up --- KJRO Monroe, LA is old school R&B, KVNS 1700 Brownsville is oldies - I wish ____ KKLF would shut down, because it interferes. But KVNS is so reliable at other times, it is almost like a local. And 1690 has a music station that comes through from Atlanta near sunset and early evening.