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Ed Fong will make you one that meets (most of) those requirements. It can be encapsulated in PVC or a Rollup - https://edsantennas.weebly.com
I have both a DBJ-1 (pvc) and DBJ-2 (rollup) and have no complaints.
Assuming it is a 4xSD1446 amp (which most of the references say it should be), it's a 300 watt amp. The numbers you are seeing lead me to believe that harmonics/splatter is where the higher numbers on the meter are coming from.
See...
I have been running a 36 amp version since 2014. It's probably been running 24/7 about 90% of the time I have owned it. I have had to open it once to clean out and lube the fan.
I'd like to see some of that 50 bucks go to RFI reduction. Like the fee, all I see is my meter go from bad to worse as more and more non-compliant devices spew RFI.
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