I never really work 80m becuase my antennas are too short for it. I've got limited space on my roof. What I'm wanting to do is add a clip-on wire to the lower leg of a ladder-line fed doublet, and work on 80m. Currently, it's a 33 ft x 33ft doublet with one leg going straight up a 13m high fiberglass pole (I added a thin fiberglass extension to a 12m spiderbeam HD pole). I'm about 5 stories up with this antenna. I can tune it with the ladder line, which goes all of the way to the shack. I'm wondering about how long I should make this clip-on leg, so I can work 80m when I want to. I realize clipping it on the low leg, which is horizontal, is less desirable, but I can't get up to the other leg to do it, being that it's so high. How long would I make the lower leg to have something that tunes, and will work at least semi-well on 80m? I'd end up with some sort of OCF dipole that is an L-shape vertical with one leg going up, and the other snaking a leg around probably 2 corners of a roof. You can see the vertical pole in this pic (it's an old pic which has a different vertical dipole on it, but location is same). Another thought would be to build a coil I could clip on and off, at the base where it feeds, but would that work well given that my lower wire is much shorter?