Tom:
Another idea would be one of the jakite telescoping fiberglass masts. Tie a
piece of 16 or 18 gauge wire to the top, telescope it up. Or, configure as
an inverted L. The masts run around $100, and telescope down to around four
feet tall.
I have worked qrp with one and a single radial laid on the ground. would be
nearly a quarter wave on 40. For 20, you could add a small coil to take you
to 5/8 or 3/4 wave.
HOpe some of this helps.