Keep in mind there is nothing preventing you from just angling the device (in its extreme, vertically) and just get an arbitrary amount of radiative surface wit

Keep in mind there is nothing preventing you from just angling the device (in its extreme, vertically) and just get an arbitrary amount of radiative surface with a given flat footprint. (other than of course, it looking unsightly and construction costs) edit: it would probably help a lot of you angle it such that it is normal to the sun rays, like where i live the sun sweeps from the east to the west, so if you angle the device north or south it would probably work even better.