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I wondered whether the center frequency could be slid up ordown as with the coventional vertical monopole by this device, or would it require dimensional adjustments to the whole antenna...

I may try to do a 2m version to play with. Would anyone care to come up with comparable dimensions? Could this be tried against the 11 meter dimensions - 11m dimensions X 0.18604651= 2m dimensions centered around 145 Mhz?