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I can't add much more than has already been said. As with any antenna the higher the better and that goes for the apex or the ends as well. I was going to suggest an inverted L antenna for 80 or 160m but Doc beat me to it.I have a non-resonant inverted L hanging down the side of my tower in a rather poor configuration I will admit. There are no radials under it and the ground is connected to the tower about four feet above the ground where the feedpoint is. The tower is well grounded with three bonded ground rods 7-8 feet deep. If memory serves me correctly there are four short radials at the base of the tower about 20-25 feet long but that's all. The wire is about 30 feet verticle and 70 feet horizontal and is only spaced a few feet from the tower at the top.The feedpoint impedance is very low on 160m,in the order of 17 ohms but on 80m it is around 225 ohms. I used a home made 4:1 transformer at the feedpoint to raise the impedance on 160m and it requires very little in the way of L or C to match it.I have had decent luck with it on 160m throughout the North East and on 80m it works well into Europe. I even worked ZS6CCY in Vallwater, South Africa with it using 100 watts and it was already nearly two hours past his sunrise.I know it would work better further from the tower and with radials but such is the case with "temporary" antennas that become not so temporary.