Hey Warren, It's on 15 a few miles north of Frederick. As you go north you'll see a shopping area on the right with a McDonalds, Roy Rogers, a few gas stations and then the "Family Restruant". If you blink you'll miss it. I'll PM you with my cell phone and we can try to do it that way too.
Go to the bottom of the exit ramp turn right and then turn left. Park in the big parking lot on the left and I (we) can see you and link up.
I'm not sure if the folks heading out of Leesburg will do.