I've always been concerned about getting a "dipole" in the air when you're up above the "tree line". This seems to be the answer when you choose to use your dipole as an inverted Vee. Pierre's signal was 599 at about 700 miles with 5 watts of power. He uses a collapsible pole and attaches it to the bike mount on his car.
I'll be experimenting with this configuration on the next "elevation" location. Although the maximum elevation is only a little over 4500 feet here in WV, finding two good tall trees can sometimes be a problem.