I know about COMANT, but who is AEA?  Is your COM2 antenna essentially the type that is described in the Lancair assembly manual?  Do you have a picture of your arrangement of antennas in your vertical stab?  I'm really interested in the Xpdr antenna? ------Sorry that is AAE. Can be found in EAA Sport Aviation magazine (1800-758-8632) Invented by a McDonnell Douglas aerospace years ago for his Long Eze. Web site is www.advancedaircraft.com  the antennas are $149 for VHF and $99 for xpdr -- you can also find them in Aircraft Spruce.

I think I will be happier with redundant GPS antennas than have a need for two NAV antennas.  Do you have any trouble with servicing your radio stack with the GPS antennas under the glare shield? ----No trouble at all

How about your ELT antenna?  ---Mounted it vertically in the tail

And finally...I'm still pretty lost on a NAV antenna, even one, on a IV-P with carbon fiber wingtips.

AEA antennas require no ground plane. Just epoxy it to the vertical stab. The transponder antenna is a shortened version. Works great.

 

Jeff