user: Question: Which Frequency MHz has a Call Sign of K218BE?
Columns: ['Call sign', 'Frequency MHz', 'City of license', 'ERP W', 'FCC info']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['K203BB', '88.5 FM', 'Gunnison, Colorado', '82 watts', 'FCC']
SQL:

assistant: SELECT "Frequency MHz" FROM "Table" WHERE "Call sign" = 'K218BE';