I have the issue with the Moorside Edge Transmitter and confirm the RF3 does little at those frequencies
Semmy, I would interpret the results as some rf going round the RF3. There are several other points of entry, even if the modem was in a properly screened box, which isn't usually the case. You have a power connection and probably, Ethernet connections which parallel the modem input.
You said :=
"I like to learn how things work, why they work etc...
Conversation, The desire to exchange views and information.
The desire to make the most of a given situation."