Greg,

When converting math into English sometimes the words aren't enough. "the
horizon in nautical miles is the square root of 2 times the antenna height
in feet.140 sm is about 122 nm." Consider that 122= 1.414X fills the bill
but so does 122=(2X)**(1/2). The second equation gives Mr. Plummer's height.
I do not vouch for the correctness of the second equation since I don't know
this field.

Dave M.