Looks to me like the right advice has already been given in this thread, so I'll summarize.
1) Learn to build a Faraday cage. It's not complicated. Grounded poultry netting is almost good enough; brass screen is better.
2) Know your grounds and their quality. Get an outlet checker. Make sure your shit is grounded. If you are using an old microwave oven as a Faraday cage, it has to be plugged in at least to ground.
3) Fuck Comcast with a dried splintered fence pole.
That is all.
OR get 2 of 'em power cords with the RF filter built in------- it should have a little 2" cylinder near the part that plugs into your digital ballast------cheaper than a surge suppressor/RF filter outlet strip mentioned earlier.