ACMAC,

The Sony ICF-SW7600GR's External Antenna Input is an 1/8"
Mono-Jack as are most 'portable' AM/FM Shortwave Radios.

Note - The Sangean ATS-909 Radio is an exception to this and
uses a 1/8" Stereo-Jack for the Radio's External Antenna Input.

hope this helps - iane ~ RHF