See also perhaps:
* https://en.wikipedia.org/wiki/Random_wire_antenna
There are also commercially available products that are fairly portable and probably give you a better SWR; e.g.:
* https://www.youtube.com/results?search_query=Buddipole
From one of the photos, seems like the author is using an Elecraft KX-2, which is really a clever bit of kit that packs a big bunch in small package:
* https://elecraft.com/products/kx2-ssb-cw-data-80-10-m-transc...
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