[Lowfer] Loop Radiation Resistance

[Lyle Koehler]

I haven't seen the "one hemisphere" effect explained, although it has to be
there, and it clears up a couple of problems. I know that your field
strength readings have been higher than they should be, based on the ERP
numbers calculated with the "standard" radiation resistance equation. There
is also a discrepancy in the "gain" comparisons between loops and verticals
when I use antenna modeling software. Here again, loops come out 3 dB better
than they should, based on radiation resistance calculations. But if the
loop is modeled in "free space" rather than "above ground", the extra 3 dB
of loop gain goes away.

This is like the joke about the professor who says, "It should be obvious",
and then, after an hour of calculations and three blackboards full of
equations, says "Yes, it's obvious". Maybe that's why it doesn't appear in
the books.

Lyle