Specs
1.5" L aluminium from Lowes (6061 I believe)
NMO L bracket w/ NMO mount
I'm not sure of how good of a ground plane this is, but I was able to reach at least ~20mi on mountainous terrain using 45W and the cheapest VHF 1/4 wave whip I could find ($9.95 + s/h)
This secures to the rails using a piece of sheet aluminium and a nut jb-welded to the back, and a 1/4-20 bolt. Yes, the bolt is rusted, yes, I'm replacing it, hopefully this week. Alternatively you can use a square spring nut from the electrical hardware section @ Home Depot, except you have to cut a good chunk of it to fit on the side rails, or attach something to it so you can mount it lengthwise and prevent it from popping out.
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