The Beamforming Elevated Array for COsmic Neutrinos (BEACON) is a proposed detector concept consisting of many phased radio antenna arrays placed on mountaintops, searching for the upgoing extensive air showers created by Earth-skimming tau neutrinos. The high elevation sites and long propagation length of radio provide each station with a large detection area, while beamforming improves the signal-to-noise ratio and lowers the energy threshold. The stations are independent, and as such can be distributed globally. A Monte Carlo, which incorporates models of tau neutrino propagation, tau decay, and air shower radio emission, has been developed to predict the effective area of potential station layouts. Here, we give an overview of the BEACON concept, and present the predicted sensitivity of BEACON to ultrahigh energy transient and diffuse neutrino fluxes.