There’s a thing called a butterfly antenna. It looks like two triangles laid tip to tip, and it’s symmetric.
It is impossible to search for, because butterflies, the insects, have antennas. The entomology world loves taking pictures of butterfly antennas, talking about them, analyzing them, and pushing images of butterfly antennas to children like aggressive science pushers.
So you have to look for something called a bowtie antenna.
It looks nothing like a bowtie.
The only good part of this is that searching lead me to the log periodic antenna, which looks like it’s even better!