Change the max value for the 60M band to 71MHz:

(You could probably change the bottom-end limit to something more appropriate, too)

rf.valid_bands = [(26000000,  33000000),
                          (47000000,  71000000),
                          (108000000, 180000000),
                          (350000000, 399995000),
                          (400000000, 512000000),
                          (750000000, 950000000)]

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