If you're having problems with RFI in the shack and have tried all the toroids you can find and are still having trouble you might try this. The excellent book "Grounding and Bonding for the Radio Amateur" recommends putting your shack equipment on top of a ground plane. 50 years a ham and I have never tried this but seems reasonable. The ARRL book suggests getting copper flashing used in building construction but I found these copper plates on Amazon pretty cheap and they are very easy to work with and very sturdy. Just search for "CynKen copper" and you will find several different sizes. The ones I have are 300 mm by 300 mm and 0.5 mm thick. They are very easy to cut with some tin-shears. Drill a small hole and hook it up to your shack ground. The pointed edges are very sharp so I trimmed them slightly to reduce the risk of cutting myself.