Well, VHF probably won't do it...range of only 25 miles or so, and it's some 50 miles from DC to Cobb Island! But, you can reach me on the land line; send me an email and I'll give you the info: bill at wdsg dot com
RE: going offshore, I have a couple of thoughts. How are you gonna navigate? Do you have GPS? A chartplotter? What kind?
I have already done the trip from the Canal to DC several times, and have plotted waypoints along the way. I lay out my waypoints so that they are safe to follow in any weather
-- no danger of running into things!
For example, here's a chart showing waypoints in what I call "Route 10" from the C&D Canal (Delaware River side) to Block Island: Gallery :: Miscellaneous 2007 :: Route10
There are 30 waypoints along this route; I can easily email you the lat/long, bearings, and distances for this and/or other routes along your track if you like.
If the weather forecast is good, it might be best to do a direct shot from, e.g., Block Island to Cape May, then up the Delaware River to the C&D Canal and the Chesapeake Bay. The direct-line distance from Block Island to Cape May is about 240 miles. If you anticipate contrary winds from a southerly direction -- and these are prevalent in summertime -- you might want to follow a track closer to the NJ coast where you could duck into, e.g., Sandy Hook, Manasquan, Barnegat Bay, Atlantic City, or Cape May if need be.