With the “Dead Bug” Method, Hobbyists Can Break Through the High-Frequency Barrier – IEEE Spectrum

https://spectrum.ieee.org/geek-life/hands-on/with-the-dead-bug-method-hobbyists-can-break-through-the-highfrequency-barrier
PCBs are essential in mass-produced products. They assure almost perfectly repeatable circuits. And PCBs with a good ground plane are essential for high-frequency circuits.
But rapid prototyping with PCBs has drawbacks compared with the speed and ease of building a circuit on a breadboard.

This article presents one practical alternative to PCB for high-frequency circuits.

The general approach is to start with a standard raw board with its copper layer untouched. Instead of using etched traces, you interconnect components with lead wires while leaving a large ground. You can easily check if your high-frequency circuit is working as designed.