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Thanks for the advice re-stability. To my amateur's eye, the thought of putting a small metal screen across the board seemed like it might be worthwhile?
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For many applications it might be OK as it is but I think a MMIC with 30dB gain at 1GHz will require very careful PCB design to make it as stable as possible across a wide range of source and load impedances. I noticed a few versions of this amplifier on ebay and the PCB layout was different on these with only a few via holes around the MMIC. So these look a bigger risk with respect to stability if you wanted to use this amplifier as a general purpose bench/test amplifier.