After reviewing a loop antenna design made of coax I decided to make a larger one for Top band. If you have something like a 2 el quad for say 20 M you can cover the space between the two el with window mesh using the 2 el as supports. This is basically the same as a loop or magnetic antenna except you have more than enough surface area of mesh that in effect, it also becomes a large Faraday shield relative to the two thin wires of a quad Feeding at one end and grounding the other makes it into a tubular style beam that will pick up all polarities thrown at it. Doesn't need a capacitor to tune as it is close to resonance on all bands! If you use aluminum window mesh then remove the coating first by soaking in Murriatic acid from Walmart then roll the aluminum weaving flat with a lawn roller. Put a light weight antenna like this on your tower and have fun on all top band frequencies. The current flow is only on the surface and follows the same paths as shown with the helix antenna on my home page Unwin antennas Give feed back as to how you get on so that others are encouraged to experiment.