In the UK, PCB layouts are copyright.
Not unless this changed quite recently, like since I last talked to my brother-in-law. I used to work for one of the very -
exceptionally - large third party manufacturers of pattern parts for cars and trucks. The company still exist, now under Very Big German owners which you've heard of. They make mostly electromechanical replacement parts and assemblies for, well, every car and truck brand I can think of. To make stuff fit in car engines and other tight spaces, you mostly need the parts to fit an exact spot, and have a very particular functionality. This means as near as possible to making a component level clone/copy, complete with the exact shape and circuit layout of the PCBs, connectors located in exactly the same spot as the originals etc.
GM, Ford, Mercedes, BMW and all the rest couldn't stop us, which is the reason why the large manufacturers are so keen on shoehorning MCUs with complex firmware onto every major assembly in a car, and not just the engine. This makes it much harder to clone the part (including PCBs), giving the OEMs a virtual monopoly on spare parts (which are now ridiculously expensive). Any Audi owners with bad gearboxes here, by any chance?
My brother-in-law still works there, so I have a suspicion I would have heard about it, if things have changed.
I'm sure I could come up with dozens of RF amplifier layouts that gave the same performance.
I challenge you to do so, and will check back with you to hear about your progress on this project.
My reference was for the symmetric PCB layout for SW amplifiers (3-30 MHz), popularized in the seventies by Helge Granberg of Motorola Semiconductors fame. This is the design with a physical layout consisting of a 'split' pair of PCBs ,with the active RF devices frequently located in a groove in the middle between the PCBs. Different sized broadband ferrite transformers located at each end, balanced DC choke in between the collectors.
I'm not sure if Mr. Granberg invented this layout, or if he just popularized it through his work at Motorola. However, I am looking forward to hearing about your alternative design suggestion, as I haven't seen anybody else come up with a better, or even remotely as effective, layout as this one since then. Absolutely everybody builds their balanced, broadband RF amp modules like this.