Thanks for all your replies so far. I have tested some more utilizing your suggestions and used circuits that are not used with 'chargers' or 'computer equipment'. It seems to be working well as long as I do not have these consumers on the line. I even was able to switch this from the barn now in a few outlets and I am quite happy so far with the results. I think I am satisfied to go with Insteon unless someone really gives me a more stable alternative that is less prone for noise.
I only found the toggle switch as a "in line" device w/o RF. Do I miss something? I need the toggle because the barn has the encapsulated plastic housings (with the red flip switch) on the outside.
I also ordered Insteon 2406H SignaLinc INSTEON Hardwired Phase Coupler.
What about the FilterLinc 10-Amp Plug-In Noise Filter like BLH suggested earlier, although he mentioned it is on the 'unfiltered pass through'? Would this situation improve my situation if I plug the PLM into it?
Is there any other filter or gadget that you recommend?
BTW - I have wired ethernet connections to the barn and the garage for my PoE cameras. If all fails my back up would have been to go through some direct control from within the buildings.
I only found the toggle switch as a "in line" device w/o RF. Do I miss something? I need the toggle because the barn has the encapsulated plastic housings (with the red flip switch) on the outside.

I also ordered Insteon 2406H SignaLinc INSTEON Hardwired Phase Coupler.
What about the FilterLinc 10-Amp Plug-In Noise Filter like BLH suggested earlier, although he mentioned it is on the 'unfiltered pass through'? Would this situation improve my situation if I plug the PLM into it?
Is there any other filter or gadget that you recommend?
BTW - I have wired ethernet connections to the barn and the garage for my PoE cameras. If all fails my back up would have been to go through some direct control from within the buildings.