Technically it's not, that black metal front support is in front of the radiator. But yes it just lays on there. It's so stiff it doesn't need help staying put. You can see mine in the pic below, it's not as close-up of a shot, sorry, but you can tell it's not held down anywhere. Looks just like Gary's.
There are two ties to the fender. My picture is a little hard to see because I made a redneck adapter plate for an aftermarket washer reservoir, but you can see one of them just peeking out behind it and the other below and left:
This seems to be enough to hold it in place. Like a lot of push-pull cables, it has a stiff outer sheath and is designed to work by having the ends fixed in place. The middle can flop around (or get routed) any which way and it will still work, but you don't want to weave it in and out of things, you want the flattest, loosest arc you can manage to minimize friction inside.
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1981 F-250 Custom. 6.6L V8, 4 barrel Holley carb, ARA aftermarket A/C.