A number of the stock scenarios in Infinity need some sort of antenna or console for the troops to interact with/hack/seize/blow up/etc. You can use basic tokens on the tabletop, but real scenery looks better!
Antenna and consoles in Inf are supposed to be on a 40mm base, so I had a go at cutting 40mm circles with my circle cutter. The stubby blade won’t go all the way through the mattboard I build with, though, so I wound up basically scoring circles and then finishing them as carefully as possible with a new Xacto blade. It’s not an ideal way to cut circles, and for larger and more visible ones like a round roof I’ve started since building these antennas I’ve gone with multiple layers of light card, which the circle cutter handles very nicely, and glued them together in layers.
The antenna themselves are more mattboard, generally offcuts from other recent projects. No particular design ethic to these, beyond “angular and futuristic”, which is easy to achieve.
Even for scenarios that don’t require antenna on the table these are likely to put in an appearance as general futuristic clutter, which is always in high demand on an Infinity tabletop!