We (NZ) are changing to digital so I expect there will be a lot comming down off roofs soon.
I save the straight bits for metal tubing for projects & cut the bends & corroded stuff off & scrap them.



The centre bits, where the ali tubes connect, using steel bolt, are easy to scrap.
After breaking off the ali tubes, place the centre bits bolt over a vertical metal tube, about 1 1/2 inch dia, in a vice.
Then hold it there & using a tough metal punch (long 1/2inch dia capscrew from a engine) & hammer, punch the metal bolt down thru the ali parts.
Chuck the Ali parts in your Ali bin.