The below antenna is simple but effective.  It's a quarter wave for the lengths given.  If you put a little "hook" at the top, you can hang it from a tree or a fixture inside the house and it will work fine. (use fish lne or something insulated, not a piece of wire however.

This is a reprint from QST, "The Doctor is IN", May 2003, listed by permission of the ARRL as noted at the bottom.