I recently put together a PCB for a termination insensitive amplifier, based on the original article by Wes Hayward, W7ZOI, and Bob Kopski, K3NHI.
The general idea is to provide an amplifier that has an input impedance (usually presenting a 50Ω impedance) which does not depend upon the output load, and an output impedance that does not depend on the amplifier input, all while providing around 15 dB of gain. These can be a good choice to use between your mixer and IF stage to reduce reflections caused by impedance mismatches.
The original design was intended for bi-directional use, but these boards are intended as a single path, with the intention of using them as a pair when bi-directionality is required.
You can find my PCB here.
The KiCad files and LTSpice can be found on my github page.