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Old 10-11-2021, 11:11 PM
olegusan olegusan is offline
Join Date: Aug 2014
Location: Melbourne, Australia
Posts: 43
Default Second VHF antenna

Hi all,

I'm going to install a second radio in my RV12 and trying to figure out the best place for the second antenna.

Can anyone share their experience with the subject?
RV-12 # 120877 VH-TAO (Flying)
Melbourne, Australia
My DIY Avionics:
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Old 10-12-2021, 02:16 PM
12vaitor 12vaitor is offline
Join Date: Aug 2012
Location: Panama City, FL
Posts: 226

I added my second comm antenna on top of the tailcone behind the ADAHRS location. In addition to a doubler plate at the antenna location, I added some J-channel reinforcement between the frames. The skin thickness seemed too thin to handle the drag load specified by the antenna manufacturer. Similar problem to the ADARHS mounting area that required a doubler to stiffen the mount.

The other problem is running another coax cable down the center channel, I ended up adding another set of pass through bushings to handle the cables for the Garmin GPS antenna, NAV/LOC antenna, and Comm 2.

John Salak
RV12 N896HS
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Old 10-12-2021, 07:35 PM
rcarsey's Avatar
rcarsey rcarsey is offline
Join Date: Jul 2012
Location: North Brunswick, NJ
Posts: 340

I'm following this. I have a ham radio antenna (146Mhz) that I've been meaning to install, but haven't pulled the trigger on yet. Unsure of how close is too close .. the frequency is close enough to aviation band that it can be an issue.

Maybe if I put it out on a wing, I won't have to install a rudder trim tab
Rob Carsey, North Brunswick NJ
RV-12iS (N713) / Completed 12/2020
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Old 10-12-2021, 08:57 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,264

I installed a second Com and put the antenna on top of the fuselage about 3 feet behind the rear window.
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Old 10-13-2021, 11:04 AM
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turbo turbo is offline
Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,257

I have two coms and an ils/vor on the bottom spaced about 3 feet apart, vor at the tail end.
TURBO YES =VAF= Payed Jan2022
Ed D'Arcy
RV6-A 5,400+ hrs, R-44 1,700 hrs, Helicycle traded for 33 FFR coupe, 300 young eagles flown
Stuart, Fl / East Hampton,Ct / Virgin Gorda, BVI - villa sold.
addicted pickle ball player
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Old 10-13-2021, 12:08 PM
RFSchaller RFSchaller is offline
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,264

When I installed the cat whiskers for a VOR/ILS I drilled out the blind rivets securing the fiberglass vertical stabilizer cap, mounted the whiskers on top and replaced the cap over the whiskers using screws and nut plates in place of the rivets.
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