i think the best way is to digitally feed inductive rf pulses into the hdr so no need for any connections to it to feed rf pulses one of my experimental prototype hdr has a trifilar pancake rubbing coil so theres one of the wires not used can be used to feed rf pulses through it i've never fully tested my hdr units so one day i may but during a paranormal ghost box session ive asked them does my hdr units work and the answer was always yes and they confirm that in the near future ill be time traveling , and these ghost do lie alot according to what they said when i arsked if ghost lies