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The Event Horizon Telescope (EHT) is a very long baseline interferometerbuilt to image supermassive black holes on event-horizon scales. In this paper,we investigate candidate sites for an expanded EHT array with improved imagingcapabilities. We use historical meteorology and radiative transfer analysis toevaluate site performance. Most of the existing sites in the EHT array havemedian zenith opacity less than 0.2 at 230 GHz during the March/April observingseason. Seven of the existing EHT sites have 345 GHz opacity less than 0.5during observing months. Out of more than forty candidate new locationsanalyzed, approximately half have 230 GHz opacity comparable to the existingEHT sites, and at least seventeen of the candidate sites would be comparablygood for 345 GHz observing. A group of new sites with favorable transmittanceand geographic placement leads to greatly enhanced imaging and science onhorizon scales.

Evaluation of New Submillimeter VLBI Sites for the Event Horizon Telescope