AM / FM / SW Active Antenna: 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 a20 to30
foot wire antenna. This circuit uses receivers that use untuned
wire antennas, such as inexpensive units and car radios. L1 can
be selected for the application
FM Beacon Transmitter (88 108 MHz): This circuit will
transmit a continuous audio tone on the FM broadcast band
(88-108 MHz) which could used for remote control or security
purposes. Circuit draws about30 mA from a 6-9 volt battery and
can be received to about100 yards.