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The cap on the DC may help. I'd try a lytic in the 1000uF range, and a parallel ceramic or film cap in the 0.01uF range, and maybe a series resistor in the 5-10ohm range between the caps and a terminal of the supply.
It don't have to travel the whole way through the AC lines. 6-10' of travel = a decent tuned VHF TV antenna (for it to transmit to the air), and 3-6" a decent antenna for UHF....
If you can grab a newer SS parts TV, video monitor, or computer powersupply most of them have a line noise suppressor built in. The new video gear used switch mode supplies too, but they build them properly so they don't make too much noise. Find the big 200V cap nearest the power cord on the parts board, it is fed by a diode bridge, everything between the bridge and line cord is the filter (usually consists of some ceramic caps and what looks like a small weirdly connected line transformer which is actually a dual line choke). Harvest that filter (or buy a more expensive one from the store if you don't have faith in your skills) and add it inline with your supply as close to the supply as you can.
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