JW,

Sort of like the "Quantum Stick Plus+" by RadioPlus+
http://www.dxtools.com/QStick.htm

Built one of these back in the early 1960s from a PopElectronics
Article. Worked Great as both an AM/MW Antenna Tuner and an
Antenna Coupler for 'portable' AM/MW Radios.

NOTE: Back in the early 1960s I managed to receive "WBZ" in
Boston using a Hitachi TH-812 (TRF AM/MW Portable Radio) with
an outboard 'inductively coupled' Tunable Ferrite Rod Antenna
Feed by a 65 Foot Random Wire Antenna.
GoTo= http://www.transistor.org/collection.../hitachi9.html
NOTE: This took me Two Winter Seasons to Log this DX Catch.

Thats' All Folks ~ RHF
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= = = (J999w) wrote in message
= = = ...
Simplest one you can make is by taking the main tuning capacitor and ferrite
rod antenna out of an old AM radio, wiring them in parallel, then putting that
circuit in series with your antenna. That will allow you to peak the frequency
you're tuned to, reducing all others. If you wire that circuit (an LC circuit)
from your antenna to ground, it will notch the frequency it's tuned to ...
kinda handy if you've got a local pest that splatters across the bands.

jw
K9RZZ