The Icarus Instruments EXTenna Switch is a small device installed in an aircraft that permits an existing VHF comm antenna to be used with any handheld VHF radio. This greatly extends the range and readability of battery powered handheld radios. The normal handheld radios "rubber ducky" antenna has very limited range when used inside an aircraft cockpit. The EXTenna Switch eliminates the need to install a dedicated backup VHF comm antenna which is both expensive and adds drag to the airframe.

This EXTenna switch uses a 1.75" x 1.30" mounting plate that installs on any 1.75"x1.30" vacant space on the panel.