Take a large spool of wire with you, with some extra rope, feedline and insulators. Then you can
make many different types of antennas - even if the connections aren't soldered you can still see
how well they work.
This is one advantage of my dipole kit: it has wires for 80, 40, 20, 15 and 10m, and I can use
them in other ways because they are not permanently attached to the coax. For example I
have used one 40m wire (10m long) as a full wave loop for 10m (it required that I add 1 50cm
clip lead for SSB and two for CW.) Another time I strung up the 20m dipole between two
rocks where the ground dropped nearly 100m between them, and made the 40 and 80m wires
into parallel-conductor feedline to reach to the radio. I have had good results with full wave
loops, which can be arranged for either horizontal or vertical polarization, as well as various
long wires, end fed half waves, and even a 15m J-pole. It all depends what best fits your
available space.