Last night I thought of the same thing. It would be easier for you to test than it would be for me. The antenna only took maybe an hour to build. I used 14 gauge copper wire. It's been a very popular topic on the FlightAware forum and several people are building them. Visit this web page and scroll down til you see the link to download the PDF file called Your First ADS-B antenna.Oh, I did not realize the problems you will have to face in swaping. No, dont do the swap. Your safety and comfort is very important.
I will do the comparision myself from the comfort of totally indoor installation inside my apartment.
Can you please give me the dimensions & construction details of your ground plane antenna? I want to build one, then test, then swap by cantenna, and test again, keeping everything else same (i.e. placement, coax, receiver, laptop). To see the real difference, i will first test both without amplifier, and a very short coax 15 feet. Later with amplifier and 50 feet coax.