One of the easiest antennas to erect and use is a long wire matched by one of the various auto-couplers on the market. The SGC 230 is an example. Properly installed, all you'd have to do is string out 20 feet or so, maybe more for the lower bands, and have at it.
Although I operate mobile, when I travel I carry a 50 foot extension with a large alligator clip on one end and an insulator with 35 feet of rope attached. Just about any old tree or post can be used to support the far end.