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Knowledgebase > In car radio > Highway 300Di > Highway 300Di installation with active
FM antenna
Highway 300Di installation with active FM antenna
Laura - 2021-10-19 - Highway 300Di
Highway 300Di provides a DC path to allow the connection of a phantom power supply from
the car head unit - through Highway - to supply any existing active aerial solution. This is
always connected, so does not require the FM-pass through to be enabled in the installer
menu. This menu option is only required if you want to listen to FM when Highway is
powered.