Martin,
?
From engineering prospective, having less headackes, by running a fiberoptics cable between two buildings with electro-optical convertors is the best solution.
However, it might cause a financial burden for the customer.
I misunderstood his application completely? by using muliple pair ethernet cable - there will not be a transfer of data at all but a remote control between the loop antenna and radio. I looked at closer the designed SPD for Ethernet cables: basically there is no RF filtering but gas discharge tube protectors between leads and common ground terminal. They cannot effect DC control leads. Of course, should be considered a parasitic shunt capacitance for RF signal.
?
Raphael
