It's Cumulus's WMAL in Washington... a nice 630 AM, but with some nasty night nulls.
This is the second time a DC station has capitalized on land value: some years ago 570 AM (the old WGMS) sold its land and moved farther outside the market with a new facility.
You're right David, I mentally transposed Hubbard and Cumulus. I remember growing up in Arlington, VA listening to WMAL 630. With all the noise these days, you can't hear them even in DC now during the day. Probably another reason why Cumulus is less than concerned about keeping that site.