We experimented with a Buddipole and a magnetic loop antenna. The mag loop can be very good as a receiving antenna. Transmitting requires that it be in the vertical orientation.
We had 166 QSOs which is not too bad for about 7 hours of operation.
Most of our QSOs were with the full size antennas. The antenna farm consisted of the ZS6BKW, a vertical inverted L with a ground system and a hex beam at 28 feet.