I've had great results from a homebuilt "Archer" clone in my right wingtip - works great for Nav. I have a similar one in the left tip for my #2 Comm, and it's fine for ranges up to 40-50 miles, but not much beyond that.
Search the Forums for "Archer", and you'll probably find a number of threads with comments, both positive and negative.
Ditto here on the wing tip Bob Archer nav antenna. I have one in the left wing tip of my 9a and it works great for nav and loc/gs. I installed a splitter on the line to feed the seperate inputs for the nav and loc/gs on my 430.
For my wingtip nav antenna I used the el cheapo one ($27) from Vans... works pretty well as far as I can tell. From 6-7000 ft I can receive VORs up to maybe 80 or 90 miles away... good enough for me. The kit is as simple as it gets, just a strip of copper maybe 36 in. long, plus a length of antenna cable and a BNC connector. Just solder the connector to the strip, then bond the strip to the inside of the wingtip. Easy!
Today I'm trying to figure out my antenna needs and am seriously giving thought to the Bob Archer antenna. I'm opening this thread back up because it is so far the only place I've read referance to being a g/s antenna. So how about it, IS the Bob Archer antenna usable as a g/s?
Jim, my understanding is that we can puta di/triplexor on the feed line and do just that. I have bought the archer Nav antenna, but not installed it yet. From what I have read, it has good results.
I have got my Archer NAV antenna hooked up to both my SL30 and GNS430 with a splitter. It work just fine. If I remember right I had to split again for the GNS430. It needs separate feeds for GS and LOC.
If you are doing a MB you can just use a 40" piece of coax with the shield stripped off.