Yes, I believe we&#x27;re at the limit of what we can do with electromagnetic radiation.  That&#x27;s not to say that there aren&#x27;t other forms of wireless I haven&#x27;t thought of, but we&#x27;ve been trying to squeeze bandwidth out of the electromagnetic spectrum for over a hundred years now, and its limitations are pretty well understood at this point.  If we&#x27;re all carrying neutrino-based communication devices in 2050, I&#x27;ll be happily proven wrong.<p>This is not to say that there isn&#x27;t exciting stuff going on in the QRP DX world (like JT65), but we&#x27;re not breaking through the power-bandwidth-distance frontier, just finding interesting new ways to trade the three off against each other.