As it turns out, of the two cars I own, neither have enough metal for a proper ground plane - even on UHF. Doah! It seems like the geometry is simpler on VHF so I ought to start there. Now - to borrow a car without a sunroof. Here's a pix of my mobile test jig sans laptop and test vehicle.
![](https://cdn.hackaday.io/images/5436731561674966720.jpg)
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