[amsat-bb] Mode S Antenna question

I have been using a 2.4 ghz Vagi antenna for my Mode S antenna the past few days. I am seeing quite a bit of signal droppout as AO-51 does a little rotating. With a circular polarized antenna do any better ? I have found a source for a 2.4ghz 10 db RHCP antenna and thought about trying that. I know I cant get it before AO-51 goes back to V/U mode but thought I could try that next time. The antenna I found has about a 50 degree pattern so I should get decent coverage since I have it pointed at a fixed elevation because I dont have an az/el rotor.

Ron KA4KYI