XHEWA-FM/XEWA-AM are commercial radio stations in San Luis Potosí City, San Luis Potosí, Mexico. XEWA broadcasts on 540 AM and is a Class A station. Its transmitter is in Soledad de Graciano Sánchez. XEWA is one of the highest powered radio stations in North America, broadcasting at 150,000 watts, using a directional antenna by day and a non-directional antenna at night. 540 AM is a Mexican and Canadian clear-channel frequency.