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AO-51 Mode S Antenna question

I have one of the K5GNA modified downconverters with the corner 
reflector attached.  Since starting to set my satellite station back up, 
this is one area that I hadnt addressed.  I have my antennas mounted to 
a Channel Master rotor on a commercial TV tripod.  The antennas are 
angled at about 25 degrees because of some ground clutter, trees, etc 
that I have to shoot over to get to the satellites.

With this setup, can I mount the Mode S downcoverter and have a 
reasonable chance at getting it to work or should I look at some type of 
patch antenna to get better signal picket ?  Is mode S a little less 
unforgiving so that I have to have it more directed at the satellite 
than I can get away with on my current VHF/UHF antenna setup ?


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