LNB is short for Low Noise Block. Or to be even more accurate Low Noise Block Downconverter. An LNB converts the frequency of the captured satellite signal to another frequency. A frequency that can be transported via Coax cable, to be precise. In-home satellite systems, the Ku-band is converted to a much lower frequency. Indeed, through the use of an LNB.

LNBF is short for Low Noise Block Feedhorn. This is an LNB in which the feedhorn is already fully integrated. A feedhorn will bundle the energy, captured by your satellite dish. The bundled energy can then be processed by the LNB, much better.