We have a product that we successfully ran through radiated EMI testing (EN55022) with our highest peak approx. 13dB under the permissible limit.
Looking at our test setup and what is required to comply with the new EN55032 standard, I see our original test setup used loopback cables which were only 0.8 meters in length rather than 2 meters.
I'm looking for an equation to help calculate what would be the worst-case increase to our radiated EMI from loopback cables which are this much longer. I have a hard time believing a 2.5x longer cable would add 13db of noise, but I have no way to mathematically support that.