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The unit allows you to configure which antenna connection is active for a frequency or preset although there are some defaults. To chance the active antenna SMA connection:# tap the HARD softkey which is first in the bottom row on the LCD# locate the box labeled "SW antenna" (should be second row top) and tap to toggle between "50 Ohm" or "Hi-Z"# tap the HARD box again to return to default displayThe difference between the two connectors: Both are identified by their impedance. The first is 50-ohm, the common impedance used in the two-way radio world such as on amateur radio equipment. The second labeled Hi-Z refers to "High Impedance" and is suitable for things like long wire antennas and magnetic loop antennas. (''simplification'') You will get the best mileage utilizing the 50-ohm SMA for tuning frequencies in the VHF band and above. The Hi-Z or high impedance SMA connection is more suitable for frequencies in the HF spectrum including shortwave radio. You can have antennas connected to both at the same time and make the selection via the radio interface.