Kubota M7040, Kubota MX5100, Deere 790 TLB, Farmall Super C
This is a tough one. If you search the topic here you'll find some recent good info and photos. There's also a photo of a commercial--$1,200--unit that could be made.
Homemade tree scoops are an idea that generally work depending on conditions and degree of satisfaction required.
I built this from a 24'' tube I found at the scrap yard, arms came from a damaged bradco grapple bucket. Blank attachment plate from richie brothers auction.