Construction notes and element math for antennas you can actually build. Pick a design, enter a frequency, and read off the cut lengths.
WA6YOU field-expedient array on cardboard, plywood, plexiglass, or foam board. Reflector, driven element, two directors, and boom spacing from one frequency.
WA6YOU SO-239 and #12 bus-wire vertical. Radiator and four radials from one frequency — λ/4, with radials 10% longer.
More builds will land here later — wire Yagis, loops, and whatever else is worth writing down.