I'm using Vista and have been without 7 (ABC - KGO) since the switch.  I too suspect it's the antenna issue. 

Guess I'm SOL until 7/15.

From KGO's website:  http://abclocal.go.com/kgo/feature?section=resources/inside_station/station_info&id=6339723

   KGO ANTENNA TRANSMISSION NOTICE

KGO-TV, VHF 7 has switched to our Auxiliary antenna while our Main Antenna is being replaced at the top of Sutro Tower.

Viewer reception will vary depending on your distance from the transmitting tower.

We will operate from the Auxiliary Antenna through approximately July 15th.

Evening reception will be normal after mid-July, but will vary when we broadcast from our auxillary antenna 7 a.m. to 5 p.m. Monday through Saturday on days when crews are working on the top of the tower to replace the other 2 large antennas serving other stations.

We expect indoor antenna reception to improve with our new main antenna. Reception will vary until the Sutro antenna project is completed in October 2009.

We apologize for the inconvenience. We appreciate your patience as we work through this antenna transition.