Never underestimate the utility of a dangling hunk of stripped wire as an
antenna.
Gain is undeterminable. Not a good choice for transmitting. But it can get an
experiment up off the ground quickly.
1. Take a short SMA jumper.
2. Cut it in half
3. Strip back a few cm of the insulation. (say 3 — don’t get all wrapped up in
6e9/300e9 \* \\epsilon_{r} )
4. You can fan the braid out in a happy little cone, flatten it to a disk, or
just cut it off.
This isn’t NIST traceable. It’s pattern is suspect. It shouldn’t be used for
transmitting. you might even want to slip some tape or insulation over the
pokey bits to avoid shorting to bad things.
But it beats waiting for that next delivery from Pasternack. And since you cut
the jumper in half, you have a second antenna to share with a friend.
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