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I am based in the Seattle area. Ten miles or so east of KSEA is Tiger Mt, a 3000 foot peak with numerous very high power commercial transmitters. Since purchasing my 1970 C model some 15 years ago I have been experiencing significant radio interference when flying within 5 miles of Tiger Mt. I experimented with placing ferrite beads on the outside of the cosxial cables connecting the radios to the antennas and heard some reduction in interference. During the recent annual my A and P and I measured the resistance between the antennas and the fuselage skin and found them to be within spec. We decided to replace the 50 year old coaxial cables with new RG400 shielded coax. Wow! The interference is gone. For those owners out there who are having interference with high power transmitters, I suggest swapping out the old cables for new ones. You will not be sorry.

Hi does anyone has experience with perfect placing antennas on a M20K for: Aspen Evolution - 2 RSM's ELT L3 - TAS antenna (+ diversity) Garmin - 2 GPS antennas 2 COM antennas Iridium antenna There is not a lot of space on top of a Mooney with avoiding interference. Thanks Hendrik

Kal at Appareo tech support was very gracious about revealing the connectors used on their Stratus units (I was shocked frankly as companies can be difficult about these sorts of things). Here's the transcript: ADS-B Connector Connector Type (to Stratus): MS-151-C(LP) connector Connector Type (to antenna): Reverse Polarity SMA If you are looking to make your own ADS-B antenna cable, these links may be helpful to you: Sporty's sells a 10 ft ADS-B cable with a reverse polarity SMA, which may prove easier than trying to find the part yourself: http://www.sportys.com/PilotShop/product/17675 Datasheet for Reverse Polarity connector to Stratus: http://www.hirose.co.jp/cataloge_hp/e35802159.pdf If you do decide to source it yourself, here's a link to the connector that would mate with the ADS-B port: http://www.digikey.com/product-detail/en/MS-151-C(LP)/H11886-ND/241Hi5101 GPS Connector Type: MCX Connector GPS Antenna MCX to BNC Adapter Cable http://www.sportys.com/pilotshop/mcx-to-bnc-adapter-cable.html Part #5955A The external antenna is an active GPS antenna. ========================================================================================================= I am planning to put my S2 on the hatrack where I have master switch power. If I don't get adequate reception with it back there I'll add external antennas and I am thinking of foil tape on the windows.