I tested an Austin Spectra against a somewhat unity gain broad band antenna and posted a gain comparison chart here: http://forums.radioreference.com/an...specialists-antenna-mon-51-a.html#post1511252
Check permalink #10.
The Spectra works better in a few specific ranges where it's resonant but the broad band kicked it's hiney over lost of the 30-512MHz range I tested.
prcguy