My experience with the King Jack has been equal to the crank ups I previously had. My last trailer the new low antenna end tip was about 6" from the ac unit. In the 2 years and cross country trips I never noticed any effect from this proximity. My results were equal.
The antenna on my current trailer is not as close to the ac unit, but it is not above it when in that direction. I had been on the road for 6 months all around the country with this trailer till June. Like the previous trailer I haven't noticed any reception issues I could relate to blockage. Maybe I'm just lucky.
Anyway, as I stated earlier, I only switched so I wouldn't have to remember putting it down. Reception didn't change from one to the other...for me.
Disclaimer: Results may vary. Not all results are the same.
