Funny ou should bring up the Antron 99 with a comparison "(24-30MHz)" against 40 10-11 meters. Well you should sitdown for this but my Antron 99 along with everyone else I know that has one can "load" them up from 17-10 meters some even loaded them on 20 Meters. Now efficient?? Nope definately wasted power but will it work?? Yupp, But let see 40, 10, 11 and 12 meters loadup verses, "Occasionally 20", 17, 15, 12, 11 and 12 meters With Antenna Tuner ofcoarse)
I have propper antennas for the bands but I take an Antron 99 along with a G5RV for portable use and they keep me busy all day and if it was for me loving 80 meters Ide just use the Antron 99. Yes I know a G5RV is not the best antenna but notice I said "portable" At home my antennas are cut to be resonate for where I talk.
You have to remember with antennas that "Efficiency" is an important factor if we want to get serious or down to the nitty gritty as alot of people do.