I was able to extend my cables with the W4RT pigtails and it worked great. I'm using them at home now on a permanent 43' vertical installation.
One other source I found for the mini DIN connectors and cables is L-COM at www.l-com.com. They have some extension cables in various lengths that I've used with good success with the FC-40. These cables could also be cut in two and spliced into longer cable runs as another option.
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Ron Parker, KE5RON
Ron Parker, KR5P