Archer NAV vs clones
I installed an Archer NAV for IFR and have been very satisfied. Not used it a lot, mainly GPS approaches, however, never failed with good distances.
The one thing I know from my research in NAV antenna when I was building that a lot of the so called Archer NAV antenna are "clones", and these where were the majority of problems existed.
Mr Archer used to individually tune each and every antenna he built and as such the difference between his $100 odd and a clone of $10 in parts was chalk and cheese.
So, if looking at either, make sure you are assessing "real" Archer NAV antenna performance and not looking at comments about home made clones. You might be surprised at the results.
RV10: Happy little Vegemite :-)
Feb 2015: Now fully functional..... and quick