I was recently reorganizing the coax cabling for my Bell 9200 PVR that only operates as an OTA PVR. When I re-connected the coax to the OTA antenna (non-powered antenna) the centre conductor sparked. This was easily repeated. I grabbed my meter and it shows 13.4VDC on the STB OTA antenna coax input. Is this normal? I don't know much about this STB but the OTA coax input is connected directly to the UHF antenna. No pre-amps no splitters. I do have a powered pre-amp I was considering installing as well. Depending on the answer I may reconsider. Thanks.