Update to MFJ-16xxT Whip Antenna:
All my tests, where I positioned the 6m MFJ Antenna on a simple stand in the lawn, didn't have any positive result due to missing counterpoise.
During a short test on Schafberg in Vienna (JN88DF57QL; 2016-05-21) we (OE1KHU and OE1GPA) tested a 10m MFJ on a triple magnet base on a cars roof and it worked fine.
[Testequipment: FT-817 @2,5W; QRG:29100, FM, vert.]
If there is no car available as counterpoise than a greater number of adjusted radials should be used.