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11-20-2018, 08:12 AM
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Join Date: Jan 2005
Posts: 834
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Fine
They?re find under cowl. You?ll still have way more satellites than required. I?ve put them all over the airplane and never had any issues. Usually tracking the max 24 satellites even partially buried. I?ve also had antennas next to each other without affect
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Steve "Stu"
Cold Lake, Alberta
7A #70015 - C-FZQX - built - sold
7A #71629 - C-FSIS - built - sold across Atlantic
7 #70215 - C-GOJU - flying - sold
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6 #60119 - C-FHBZ - built - Airventure 2016 Bronze Lindy - sold
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4 #2723 - building
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11-20-2018, 08:32 AM
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Join Date: Mar 2006
Location: Edmond, OK
Posts: 194
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Garmin multiple GPS antenna install min distance
From the Garmin install manual for IFR installations:
"no closer than 12 inches (center to center, 9 inches minimum) from other antennas, including passive antennas such as another GPS antenna or XM antenna. This will minimize the effects of shadowing at 5° elevation angles."
"4. To maintain a constant gain pattern and limit degradation by the windscreen, avoid mounting the antenna closer than 3 inches from the windscreen.
5. For multiple GPS installations, the antennas should not be mounted in a straight line from the front to the rear of the fuselage. Also varying the mounting location will help minimize any aircraft shading by the wings or tail section (in a particular azimuth, when one antenna is blocked the other antenna may have a clear view)."
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Dan Burdette
Skyview, ADS-B, Garmin 420W, TT Gemini AP
RV-9A, IO-320, E-Mag
Guthrie-Edmond Rgnl, OK (KGOK)
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Last edited by Dan B : 11-20-2018 at 08:36 AM.
Reason: Additional information
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11-20-2018, 10:00 AM
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Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,966
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I had absolutely wonderful satellite reception with my Garmin G3X antennas mounted on a shelf under the cowling on my RV-10 with the GTN-650 GPS antenna mounted on the cabin cover. I will be putting the G3X antennas again under the cowling of my -9A along with the GTN-650 GPS antenna under there. 6'-6" is the minimum GPS antenna cable length for the 650.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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12-01-2018, 08:50 PM
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Join Date: Mar 2018
Location: Snead Island, Florida
Posts: 205
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My G3x and 650 antennas almost touch each other and work just fine. No feedback on Dynon but I don?t think these passive antennas are very sensitive to other passive antennas. YMMV
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Mark
RV-10
Bought not built
EAA 180
48X
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12-02-2018, 07:17 AM
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Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 546
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Inside Right Wingtip
Dynon GPS-2020 and Garmin GA-57X. The top edge of each antenna just barely clears the inside top of the wingtip. No issues with either one.

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Dan Langhout
2020 =VAF= Dues PAID . . . . .
RV-7 N528DP slow build
First Flight July 26th, 2014
665 hours and counting . . . .
Now based at Moontown (3M5)
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12-02-2018, 07:30 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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Quote:
Originally Posted by MConner
My G3x and 650 antennas almost touch each other and work just fine. No feedback on Dynon but I don?t think these passive antennas are very sensitive to other passive antennas. YMMV
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Actually GPS antennas are not passive, they have amplifiers and associated electronics in them. Many instances of the old GA35 antennas going bad and taking out nearby GPS's. Mount them next to each other at your own risk, I will never mount an IFR antenna next to another GPS antenna.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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12-02-2018, 08:03 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,065
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I have a Garmin 296 GPS antenna and uAvionix SkyFYX-EXT ADS-B antenna mounted side-by-side on a shelf under the fiberglass cowling on my RV-12. No problems ? excellent GPS reception and dozens of good PAPR reports.

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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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12-02-2018, 08:23 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Quote:
Originally Posted by Walt
Actually GPS antennas are not passive, they have amplifiers and associated electronics in them. Many instances of the old GA35 antennas going bad and taking out nearby GPS's. Mount them next to each other at your own risk, I will never mount an IFR antenna next to another GPS antenna.
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Note that the Dynon GPS antenna doesn't even have a co-ax cable going to it. All of the processing electronics are within the antenna and it has a digital output.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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