Second VHF antenna

[olegusan]

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?

[12vaitor]

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.

https://flic.kr/p/2mAcd3T

John Salak
RV12 N896HS

[rcarsey]

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

[RFSchaller]

I installed a second Com and put the antenna on top of the fuselage about 3 feet behind the rear window.

[turbo]

I have two coms and an ils/vor on the bottom spaced about 3 feet apart, vor at the tail end.

[RFSchaller]

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.