Heavy Duty Universal Tube TV Antenna Satellite Dish Mount - $15 (WINDSOR)

used for my satellite dish, can also used for solar panels.
this one is heavy duty, with 2 bars as shown, others only has a single mount, this one is re-enforced and all screws included.
see photos.
note you get 2 kinds of screws, 4 of them to fasten the 2 bars to the master mount, and there are several wood screws to fasten them to the roof/wall/ tree etc from a smoke free and pet free home.