Interferometry is a way to beat this fundmental limitation on the resolution of your telescope. Opitical astronomers have long know that the beams two widely separated telescopes can be combined to yield a resolving power equvalent to a telescope with a diameter equal to their spacing. This method of observing was initially perfomed with a single radio telecope in Australia in the late 1940's. A cliff mouned radio telescope was pointed out to sea. It saw both the wavefront coming directly from objects near the horizon, but also waves reclected from the ocean. This mirror image or the telescope in the ocean's reflection created a interfence patteren show above as the object moved across the sky.