I tried it just stuck to the top of the cage, but it rotated as I drove and lost reception. I wound up just putting it on top of the stock spare tire hinge and it worked great all weekend. Drove from Sacramento to Reno, around Reno all weekend, and back and I only lost reception twice, but I was in a really steep canyon right up next to a 300-400 foot high cliff. I think I would have lost it there no matter where it was mounted. I was really impressed the way it worked in Down Town Reno. I thought the buildings would block it for sure, but it worked great.