Hello there Phygar! I too had been having trouble posting in certain threads here which are quite old. I think this forum is pretty much unmoving as you have stated. Anyway, that being said, I am from New Jersey. Feel free to post me if you have any updates.
I usually don't find much on highways. Even with high gain antennas its just a matter of distance and other people have already found the hosts. I usually look for places in the direction I'm driving where I can get off the highway for a few miles and then get back on. If I see a set of buildings off of a common road on a highway I'll turn in and loop around. Also I've noticed that a lot of cities aren't mapped except for major roads that go through them. So I take rides through the small streets to find sites. Note: having a GPS is real handy for when you wander around a while and then have no clue what town your in.