Only thing is, that the background radiation from nature is the environment that we've been evolving inside. Perhaps we evolved to use that background radiation, at the very least it would have to be taken into account, just like the experiment with the FPGA's. Making it akin to aether. Which while there was the michael-morley(sp?) experiment to debunk aether, the interesting thing about the experiment if you choose to read it, is that what they disproved was not aether, but something they choose to call aether.
Not saying aether exists, just that the debunking experiment was a poorly crafted piece of garbage, but probably acceptable in the early days of science before the common knowledge of methodologies and fallacies such as the straw-man.