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Dean,
It is possible to use a single comm antenna but it takes something like this:
http://www.aircraftspruce.com/catalog/avpages/comantswtich601.php
It's not a very common installation and it's a lot more expensive than a second antenna!
My layman's understanding is that transmissions from one radio become over-powered receptions to the other radio. So most commonly, two comms each use a dedicated antenna.
On a Legacy, the second antenna can go aft of the primary. It needs to be centered a minimum of two antenna lengths from the other comm antenna. That makes it a challenge to use a straight antenna as it may hit the ground before the tail tie-down. We've put an antenna in that area, and we may have ended up using a bent whip like a Comant CI-122.
Nav antennas can be split without worry.
Dave Saylor
AirCrafters
140 Aviation Way
Watsonville, CA 95076
831-722-9141 Shop
831-750-0284 Cell
On Fri, Dec 30, 2011 at 9:07 AM, Dean Whiting <dean.whiting@gmail.com> wrote:
I was looking for some advice about communication antennas. The legacy is setup to have one com antenna. We want a capable IFR airplane and I am hesitant to have one antenna with a diplexer (or is it duplexer, I've seen it both ways) as a possible single point of failure. Is this the method that most people are using? If you mounted a 2nd com antenna, where did you place it? I searched the archives and found someone else who asked the same question but I couldn't find the answer. Any other input or advice on the subject would be appreciated.
Dean Whiting
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