Richard Harrison wrote:
. . .
A higher Q antenna results in more voltage, more radiation, and more
reception. It also has less bandwidth.
. . .

There's a problem here. Let's say we begin with a smallish loop antenna,
one small enough so it has essentially equal current around the
perimeter. We'll make it using a perfect conductor. Put 100 watts into
it; since it has no loss, 100 watts will be radiated, distributed in a
dipole-like pattern.

Now reduce the size of the loop. The Q will increase.

You've said that because of the increase in Q, it will have more
radiation. My question is, does that greater radiation result from a
more directional pattern, or from more power being radiated? If the
former, why would the smaller loop have a sharper pattern than the
larger one (considering the assumption made about the initial loop
size)? If the latter, we've really stumbled onto something here -- more
than 100 watts out with 100 watts in. Perpetual motion, here we come!

Roy Lewallen, W7EL