user: Question: Tell me the sum of frequency for ERP W less than 1
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'Class', 'FCC info']
Types: ['text', 'real', 'text', 'real', 'text', 'text']
Sample row: ['WCRG', 90.7, 'Williamsport, Pennsylvania', 3000.0, 'A', 'FCC']
SQL:

assistant: SELECT SUM("Frequency MHz") FROM "Table" WHERE "ERP W" < 1.0;