[BC] efficiency vs height

[PeterH5322@aol.com]

>The really noticeable item is that maximum ground wave radiation is given at
>0.63, but it falls away to 40% by 0.8, and to 20% by 0.85 and to *nothing*
>at 1.0 lambda.
>Whereas the penalty for running 0.125 is about 47%

Maximum horizontal field for a non-sectional radiator is at 5/8-lambda, 
which is 0.625. 0.63 is 0.625 rounded to two significant digits. This is 
225 degrees.

Best overall performance for a high-powered station with a non-sectional 
radiator is at 5/9-lambda, which is 0.556. This is 200 degrees.

A 1-lambda radiator which is sectionalized into two co-located radiators, 
and is center-fed, performs much better than any other. This is a 
Franklin.

Various radiators and their approximate efficiencies are as follows:

90 degrees: 305 mV/m/kW at 1 km
180 degrees: 375 mV/m/kW at 1 km
190 degrees: 395 mV/m/kW at 1 km
195 degrees: 400 mV/m/kW at 1 km
200 degrees: 405 mV/m/kW at 1 km
180 over 180 degrees: 510 mV/m/kW at 1 km

The best "anti-fading" performance is seen from 180 over 120 degrees.

120 over 120 degrees isn't significantly better than 195 degrees to make 
up for the higher capitalized cost and the higher maintenance expenses 
associated with such a radiator.