[amsat-bb] Mode S Antenna quest

I have been experimenting with different Mode S antennas for portable/mobile use. My latest test was with a Luxul flat panel antenna (http://www.wisp-router.com/wri/itemdesc.asp?ic=CPFP%2D24%2D11&eq=&Tp...). This one was a disappointment in this application. I went back to the K5GNA reflector. The problem is that it doesnt lend itself to packing into the Pelican 1490 briefcase that I keep my satellite demo kit in.

Has anyone tried any of the "flat panel" type of antenna with good success ?

Thanks,

Ron KA4KYI