John,
If you only need to raise power slightly, there is a FAR BETTER way to go
than either proposal you listed.
IMPROVE your antennas! You can double your power with a phased array of
two verticals for a given band. You can use a wire type antenna on its
harmonics, where it will give gain. (Double Zepp dipole for example). You
can build a Moxon beam, a compact two element type that rivals the front to
back of a 3 element beam which is much larger.
You can put up a multi band beam for 20m and up.
Your electricity cost will not skyrocket as it might with use of a full
input amplifier; and you will see an advantage with IMPROVED RECEPTION!
73,
Stuart
K5KVH
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