On Jun 20, 10:04*am, "Pete Bertini" wrote:
I was wondering
if tapering the spacing on the feedline would give me a smoother
impedance where the open wire, arrestor, and twin coax arrange-
meet?

My "ARRL Antenna Book", 20th edition, has a section on "Tapered
Lines". They say it should be at lease one wavelength on the lowest
frequency of operation. They give an "air insulated" formula for such
a design.
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73, Cecil, w5dxp.com