With the high power units at EK, I could smell the ozone even with an efficient exhaust. The RF generated would cause a lot of noise if anyone had a radio in their lab. The unevenness could be eliminated by having more than one discharge unit. At EK we used a wire IIRC. In fact, one patent refers to renewable wire corona discharge units with the wire coming off a spool slowly as it is wearing away due to use. The metal being discharged onto the film due to this wear can be a problem.

PE