Vibration/pogo effect
 

I've noticed a pogo effect/vibration in my F-type R since I've had it, but it seems to be getting worse. It does it all speeds, but is worse on the freeway. It is not dependent on suspension setting. I noticed it more when I got a new radar detector because as I drive down the freeway, it sometimes looks like it's going to shake off the mount. I also get a rattle in the back above about 75, but it's not the luggage cover. I removed it and it didn't help. Here's a quick video, but it seems worse in person. Has anyone else experienced this?

Wheel balance, or an out-of-round tire?

Yeah could be, but it feels more like a suspension or chassis thing. I’ll have the dealership take a look and see if they can pinpoint a cause.