T o d d P a t t i s t wrote:
Tim's note is correct - you can't use a rubber ducky type
antenna for a certified ELT installation, but if you don't
have to have an ELT under the FAR's, you can use any antenna
you want. The other option is a center fed dipole tape
antenna. I know Tim sells those too.

I think it is fairly clear that for a glider with an experimental
certificate, you can pretty much install an ELT any way you want, and
likely get away with signing it off yourself (as a non-A&P). I think it
is also fairly clear that an ELT installation in a type certified glider
will require at least an A&P (and possibly IA) sign off, but probably
does not require a 337. The question in my mind, however, is whether
the typical A&P (or IA) would be willing to sign off an ELT installation
in a certified glider, that makes use of uncertified components (like a
rubber ducky). Any A&Ps out there willing to comment?

Marc