Numerous searches on the web have yielded little when it comes to calculating the capacity of a “HAT” at the top of a vertical whip. In my case, I want to know the rough or ballpark capacitance in air that a solid disk with a surface area of 38 square inches would have. 73, J.B., VE3EAR LowFER Beacon "EAR" 188.830 kHz. QRSS30 EN93dr