These automatic tuners are suitable for coax or endfed antennas. The tuners are weatherproof and suitable for outdoor use. The max. transmit power is 300, 600 or 1500W, depending on model. All tuenrs tune antennas over the entire shorttwave range from 1.8 to 30MHz. The time to tune is max. 15 seconds, but usually as low as 5 seconds, because once found settings are stored in one of 10000 permanent memories.