CREATE TABLE table_75557 ("Call sign" CLOB, "Frequency MHz" FLOAT, "City of license" CLOB, "ERP W" FLOAT, "Height m  (  ft  ) " CLOB, "FCC info" CLOB)

What is the number of Frequency MHz in woodstock, georgia?
SELECT SUM("Frequency MHz") FROM table_75557 WHERE "City of license" = 'woodstock, georgia'
SELECT SUM("Frequency MHz") FROM "table_75557" WHERE "City of license" = 'woodstock, georgia'