Here's what they say about the SWL version: http://iacantennas.com/13-120-Meter-SWL-Broadcast-Bazooka-Antenna.26
"•Since this antenna has no exposed metal wire static charges can not build up hus reducing noise by 6 dB over antennas constructed of exposed wired"
So wire antennas such as dipoles ought be plastic coated? Hmmm. I worked 350 countries without knowing that!