So, didn't have to do much trouble shooting last night. Pulled the plane out of the hangar, fired up the iFly, and had 11 satellites. Picked up the external antenna and held it in my fist, kept all 11. I'm thinking the antenna is kaput. I have my iFly flush mounted in my panel not too far under my glareshield. I'm suprised I have such good reception using the internal when mounted this way. Just ordered a new antenna - $28 for a new one isn't too bad to see if it fixes my issues. Just hope it arrives in time for my trip to OSH!