I think that is the Don Croft style, they are meant to be really good. Can you do me a favour and just clarify what sort of device you are using against 5G? I thought that the only way to buffer those frequencies is to match the frequency and Hz with an equal or greater signal, or use the paint or fabric to block it, but i haven't heard of any device that can block it.
Anyway be interested to know as it all helps us keep informed and that helps us all in the long run. Speak to you soon mate