Per the US Band plan the following frequencies can be used for hotspots. Please confirm that you won't be interfering with anyone or anything when on the frequency you select:

Auxiliary Repeater Links 433-435 (12.5 kHz Steps)
433.0125 433.2625 433.5125 433.7625 434.0125 434.2625 434.5125 434.7625
433.0250 433.2750 433.5250 433.7750 434.0250 434.2750 434.5250 434.7750
433.0375 433.2875 433.5375 433.7875 434.0375 434.2875 434.5375 434.7875
433.0500 433.3000 433.5500 433.8000 434.0500 434.3000 434.5500 434.8000
433.0625 433.3125 433.5625 433.8125 434.0625 434.3125 434.5625 434.8125
433.0750 433.3250 433.5750 433.8250 434.0750 434.3250 434.5750 434.8250
433.0875 433.3375 433.5875 433.8375 434.0875 434.3375 434.5875 434.8375
433.1000 433.3500 433.6000 433.8500 434.1000 434.3500 434.6000 434.8500
433.1125 433.3625 433.6125 433.8625 434.1125 434.3625 434.6125 434.8625
433.1250 433.3750 433.6250 433.8750 434.1250 434.3750 434.6250 434.8750
433.1375 433.3875 433.6375 433.8875 434.1375 434.3875 434.6375 434.8875
433.1500 433.4000 433.6500 433.9000 434.1500 434.4000 434.6500 434.9000
433.1625 433.4125 433.6625 433.9125 434.1625 434.4125 434.6625 434.9125
433.1750 433.4250 433.6750 433.9250 434.1750 434.4250 434.6750 434.9250
433.1875 433.4375 433.6875 433.9375 434.1875 434.4375 434.6875 434.9375
433.2000 433.4500 433.7000 433.9500 434.2000 434.4500 434.7000 434.9500
433.2125 433.4625 433.7125 433.9625 434.2125 434.4625 434.7125 434.9625
433.2250 433.4750 433.7250 433.9750 434.2250 434.4750 434.7250 434.9750
433.2375 433.4875 433.7375 433.9875 434.2375 434.4875 434.7375 434.9875
433.2500 433.5000 433.7500 434.0000 434.2500 434.5000 434.7500

Auxiliary and Control Links, Repeaters, and Simplex (Local Option) 445-447 (12.5 kHz Steps)
445.0125 445.2625 445.5125 445.7625 446.0125 446.2625 446.5125 446.7625
445.0250 445.2750 445.5250 445.7750 446.0250 446.2750 446.5250 446.7750
445.0375 445.2875 445.5375 445.7875 446.0375 446.2875 446.5375 446.7875
445.0500 445.3000 445.5500 445.8000 446.0500 446.3000 446.5500 446.8000
445.0625 445.3125 445.5625 445.8125 446.0625 446.3125 446.5625 446.8125
445.0750 445.3250 445.5750 445.8250 446.0750 446.3250 446.5750 446.8250
445.0875 445.3375 445.5875 445.8375 446.0875 446.3375 446.5875 446.8375
445.1000 445.3500 445.6000 445.8500 446.1000 446.3500 446.6000 446.8500
445.1125 445.3625 445.6125 445.8625 446.1125 446.3625 446.6125 446.8625
445.1250 445.3750 445.6250 445.8750 446.1250 446.3750 446.6250 446.8750
445.1375 445.3875 445.6375 445.8875 446.1375 446.3875 446.6375 446.8875
445.1500 445.4000 445.6500 445.9000 446.1500 446.4000 446.6500 446.9000
445.1625 445.4125 445.6625 445.9125 446.1625 446.4125 446.6625 446.9125
445.1750 445.4250 445.6750 445.9250 446.1750 446.4250 446.6750 446.9250
445.1875 445.4375 445.6875 445.9375 446.1875 446.4375 446.6875 446.9375
445.2000 445.4500 445.7000 445.9500 446.2000 446.4500 446.7000 446.9500
445.2125 445.4625 445.7125 445.9625 446.2125 446.4625 446.7125 446.9625
445.2250 445.4750 445.7250 445.9750 446.2250 446.4750 446.7250 446.9750
445.2375 445.4875 445.7375 445.9875 446.2375 446.4875 446.7375 446.9875
445.2500 445.5000 445.7500 446.0000 446.2500 446.5000 446.7500