My build of the classic compact, multi band antenna for 20m, 17m, 15m, 12m & 10m.
Built on a budget but with great results, even in a loft. Just right for me.
My build of the Sarcnet Azimuth / Elevation rotator that uses inexpensive DC motors and arduino modules for a lightweight satellite rotator
Another cheap to make but really handy long wire antenna that helps with the low bands but doesn't take up a huge amount of space.
Take a commercial 5 element 2m yagi and put it on a diet. Add in a bit of 3D printing and there you have it, a sensible approach to backpacking contest antennas.
Not too hard to build and transport.