At 1903Z, Dec 21, 2015, I had a CW QSO with John, WA1ABI, on 7.020.00 MHz. I had reconfigured the Christmas Tree Antenna so that the “hot” side of my feedline was tied to one side of the lights string, and the other side was tied to the AC Extension Cord U Ground Pin. That seemed to bring up my signal level on the RBN, plus John was able to copy me. I heard him booming in as S5, and he heard me at S3.
In addition to success with John, my signal was heard by more RBN stations and at pretty decent levels.