Look up the 20-280 Radio Shack Amplified Shortwave Antenna
There are a few on ebay cheap
I have two of them
There are a few on ebay cheap
I have two of them
Look up the 20-280 Radio Shack Amplified Shortwave Antenna
There are a few on ebay cheap
I have two of them
Input ................................. SO-239 Connector
Output............................... SO-239 Connector
AC Adapter IN ................. 9-12 VDC Input @ 45 mA (3.5 mm plug)
Ground.............................. Wing-nut, rear panel
Other
Frequency Coverage......... 300 KHz to 40 MHz
Antenna ............................ 20" Telescoping Antenna - mounted through hole in
the top (connected to input SO-239 connector). An
external wire antenna plugged into the SO-239
The above is a copy and paste from their website; You will need to find some way to transition from a SO-239 socket.
You could use a 'banana' (they fit into the SO-239 socket quite nicely) plug and a alligator clip wired into a 3.5 plug or you could get a PL_259 and coax or wire and wire it into a 3.5 plug.