If you could go to two antennas, I would try a doublet for the lowest frequency feed with twin lead facing North and South. Then another doublet for the lowest frequency feed with twin lead facing East and West. That, and a switch box, will make you a
very happy ham!

The next question would be, where to put the vertical wire antenna!

Wire antennas are
very inexpensive, easy to build and hide. No sense limiting yourself.
