With a 7.5 meter ground wire you have a vertical effectively 15 meters
tall fed away from the bottom, quarter wave resonant at 5 MHz. It NEEDS
those radials. You would be better off with any center fed wire fed with
tuned feeders. Make the flat top (or inverted V) whatever fits between
the available supports, use ladder line for a feeder and a balanced
tuner. It can work more bands than any other antenna, limited mostly by
the tuner (unless its really short) and doesn't have that ground wire
length problem.
73, Jerry, K0CQ
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