Just FYI, I designed a protective case for the H4. It is a bit oversized to allow additional SMA connectors to be left on to prevent abuse to the connectors attached directly to the circuit board.
The files are on Thingiverse. I 3D printed mine in PLA but any material should work. There is a bit of room between the connectors at the top to allow a small piece of rubber to be placed if you desire a tighter fit. Look for NanoVNA H4 case or under my designs using Medic433.
Hope you find it useful.
Darrell Carothers
Sent from my over-rated IPhone 7 Plus. Any Mis-spellings or grammar errors are due to my IPhone auto correct feature.
Darrell Carothers