Calling on the Mobile HF Amateur- Experts: Help me build a NO-Compromise 75 meter mobile antenna. I don't need wide-band, don't need multi band, and in my mobile world QRP begins at 100 watts. My goal is state-wide comms inside 600 miles radius. I have around 500 watts to radiate, my mobile ground plane is roughly 150 square feet. Maximum height while rolling should be under 14 feet, but if the antenna is tough enough, or spring mounted and "leans back at highway speed" we can go a little taller. For mobile DC power I have installed deepcycle 4D 170 amp-hour flooded lead acid battery, and a fairly high duty cycle 22 SI alternator which can maintain 160 amps output for a few hundred hours. The ALS500M amplifier is a potential weak link, but for intermittent SSB use has held up without breakage since 1996. Thinking about a top loaded inverted L, with trailing counterpoise ...? Anyone old enough to remember fuel tanker trucks trailing ": Ground wires" ? . Lets' not be afraid to think outside the RF cage here, I have lots of room, and lots of wire to experiment with.