I won’t say anything about UHF, the spread of the DC UHF stations is a bit frustrating, but for VHF stations there is a neat trick you can use to get the DC VHF stations and the Baltimore VHF stations.
Channelmaster still has limited stock of the VHF jointennas. A CH12 jointenna will join channels 11 to 13 (from personal experience), or a CH8 jointenna will join channels 7 to 9. DC’s VHF stations are 7 and 9 (with a low power 8, and ion repeated on 12; ion is available in the DC UHF group). All that together means with 2 VHF antennas and a jointenna you can get the VHF stations from two markets on one coax.
I would point a Y10-7-13 at Baltimore (50 degrees true/61 degrees magnet) for 11 WBAL NBC and 13 WJZ CBS. I would point a Y5-7-13 (or a Y10-7-13) at DC (170 degrees true/181 degrees magnet) for 7 WJLA ABC and 9 WUSA CBS. I would order a channel 12 jointenna from
http://www.channelmasterstore.com/JO..._p/cm-0582.htm and the DC antenna would go to the broadband input, the Baltimore antenna would go to the channel 12 input, and that could go to the VHF input on a UVSJ or signal level appropriate preamp’ VHF input.
(That would also work to join an Y10-7-13 pointed at Baltimore with a channel 7 to 51/69 antenna pointed at DC.)