Thought I would chime in on this as it is our product in question.

Product spinning when tightened: Our conversion sleeve that inserts into the power antenna tube where the old mast was, will spin when the antenna is tightened onto it. It is designed this way as the insert is a floating part in the antenna tube. This spinning does not pose an issue, the important part is that the sleeve is held into the antenna tube so it does not come out.

Reception: Our 6 3/4" antenna may not be the best choice for all locations. Due to the much shorter size it will not have the range the factory 31"+ antennas have, so it will not be the greatest option in more distant and rural locations. It is a very durable antenna and is close to being indestructible. We do have an array of different antenna lengths of multiple different materials, we can pair our conversion kit with whatever option of your choice but the 6 3/4" is the default. The closest reception option to the factory power antenna mast is the 31" Spring Steel. If you want to pair the kit with a different length or currently have our product and would like to opt for a different antenna size just give me a call, we are located here up in Wisconsin.

Hope this information helps.

Zach
920-686-0644