Chawver, I am down in the Fredericksburg area and receive programming from the DC at 55+ miles using my Channel Master 4228 UHF antenna w/CM-7775 preamp. Everything comes is pretty well, but I must admit that WTTG-DT (FOX 5) can cause me a little grief at times. In my case it's not a big deal since I have a 2nd antenna that receives all the Richmond VA stations, so I'll just watch the game on FOX35 in the rare case I am having trouble.
Ok, here is the problem: although FOX5 is broadcasting a max power (1000kW), there DTV antenna height is over 200ft. lower than WUSA-DT (9-1), WJLA-DT (7-1) and WRC-DT (4-1). The farther you live away from the tower the more adversely you are affected. Also, their DTV antenna is side-mounted and on the other side of the tower. So if you live out toward Winchester VA the reception is excellent, but if you live East and South of the city, again, your reception is less-than-stellar in you are on the fringe (or deep fringe in my case).
What can you do? Well, you can purchase a higher gain antenna (you already have a pretty good one) or you can raise your antenna a little higher. But there is good news, the folks at FOX5/UPN20 are going to co-locate their DTV antennas next year: UPN20 will finally move to their permanent tower and broadcast at full power and FOX5 will move their DTV antenna up the tower 200ft and move it to the other side of the tower by next summer. FOX5 should be coming in loud and clear in a few months.
However, if you can't wait...you could try using a CM-4228. I swear by them. Hope this info helps.