Check out the AlexLoop WalkHam portable magnetic loop antenna at www.alexloop.com. I have used this on local hikes with my K1 and KX1 and it works great! You'll need a cheapo photo tripod. It is bulkier than a simple wire but still lightweight and comes with a handy carry bag as well.
Ditto. I've used my AlexLoop (standard version) with a KX1, and been
amazed at how will it works. My first QSO with the AlexLoop and the
KX1 was with a station in Maine (from here in EPA). I was running
about 1 watt. I forget the report, but we had solid copy both ways.
Thanks for the comments on using the KX1 on the trail. I will probably wait on something like the AlexLoop but I am curious about how it performs versus the Buddipole antenna. I mean, if I am going to carry an antenna contraption rather then just coils of wire, the Buddipole looks interesting too.