This is true, although perhaps obvious.. Now you have the problem of a
nonlinear device at the antenna input. If he lives in an urban area, it is
an invite to horrible IM and crossmod problems. Usually not considered good
engineeering practice.
A better solution might be to forget tuning the whip input and use a high
IP3 amplifier as in the Amrad project, or use a simple stepper motor to turn
an air variable cap.

Dale W4OP
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Hi Dale
I am presently constructing the Amrad Active Antenna with the specified
parts.
I am kind of in the Burbs but I can see a small mountain about 10 miles
airline that has an FM, 93.1mhz, station, UHF tv, channel 40, station
and who knows what else.
I found plans on building a MW phaser using loop and/or active
antennas. I suspect the Amrad will be the better active antenna. This
will bre a learning process for sure.

Richard