In the early 1980’s, when I worked for Slingsby Aviation, the 118-136MHz Com-1 antenna on the T67 Firefly consisted of a self-adhesive 1/2" copper tape vertical dipole on the inner skin of the GRP vertical fin.
The 75MHz marker beacon antenna was the same construction but in that case mounted horizontal inside the rear fuselage. When doing this it’s important to note that the antenna must be shorter for resonance than in free space.
When we tested a Vertex VHF radio, specified by Belize as additional equipment for their aircraft, I knocked up a quick single-use Slim-Jim using copper tape on a length of fibrelam for use as the ground station antenna which worked very well.
Before SOTA I made a Slim-Jim for 70MHz-FM which was used to activate several summits in the 1990’s. That consisted of 1/2" copper tape between two layers of 2" duct tape. Hung from a 6.8m mast the performance with a Yaesu FTC-740A 40W-FM rig was terrific but the downside was the wind. After a few activations violent flapping broke the copper tape and that was the end of that.
What’s left of the copper tape is now used by my XYL. She sticks it round the rim of her Hoster plant pots to discourage slugs. Apparently they don’t like crossing it. Who knows?
73, John
thanks