So the list is chs 106, 120, 194, 195, 404, 192, 215.
Not sure about the polarisation issue.
Frankly my enthusiasm for in depth fault finding for MCs benefit waned when they actively pursued a campaign to drive the SD PVR into obsolescence.
Can't comment on Explodas. My daughter's Explora original connected to an LMX 500 with a Pace 2- tuner in XV has been running trouble free for close on 6 years I think. Also a 90cm antenna repointed by me when she moved in after installing it under the eaves in a sheltered spot. The previous owner reported in the sale document of the property that the "dish was faulty".
All it was another accredited installer bugger up
No fancy HB cabling used though, bog standard simple HB cable installation.