I run a handful of odroid sbcs constantly with 3x rtl-sdr usb radio receivers each. For their cases I used the cardboard box they shipped in covered in overlapp

I run a handful of odroid sbcs constantly with 3x rtl-sdr usb radio receivers each. For their cases I used the cardboard box they shipped in covered in overlapping 2" conductive-glue backed copper tape. And lots of type/mix 63 ferrites on the cords.