This circuit shows an active antenna that can be used for AM, FM, and shortwave
(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot
wire antenna. This circuit is designed to be used on receivers that use untuned
wire antennas, such as inexpensive units and car radios. L1 can be selected for
the application. A 470uH coil works on lower frequencies ( AM ). For shortwave,
try a 20uH coil. The unit can be powered by a 9 volt battery. If a power supply is
used, bypass the power supply with a .04uF capacitor to prevent noise pickup. The
antenna used on this circuit is a standard 18" telescoping type. Output is taken
from jack J1 and run to the input on the receiver.
Source: "Popular Electronics" Magazine, Jul,89 issue. (C)Copyright Gernsback Publications,Inc., 1989 - Please read their disclaimers before implementing this circuit.