Topband: Comparing Commercial EWE/ and Pennant Transformer Units?

[Eric Rosenberg]

Over the last couple of years, I've managed to collect far too many 
commercially built receive antenna transformers for my attempts at EWE's 
and pennants (K9AY, K1FZ, KD9SV and ZJ Electronics).

I don't have quite enough of any one for my "farm" (can you say "urban homesteading?"), and as a result I'd like to choose *one* brand/model. 

How do I test and compare them to make a learned choice.

Your suggestions and comments are appreciated!

73, 
Eric W3DQ
Washington, DC