I found a problem with the Invader today. I was out mowing the lawn and wearing ear muffs/AM-FM radio and listening to an AM talk show. Every time I took a hit I got a squeal out of the radio from the RFI the thing give off. Jeesh, it's in a zinc enclosure that should stop most of the RFI. Maybe I need to ground the case of the Invade to the ground of the radio or tractor (NOT!!!!).