Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_49240 ( "Call sign" text, "Frequency MHz" real, "City of license" text, "ERP W" real, "Class" text, "FCC info" text )

### Question ###
Which Frequency MHz has a Call sign of k210dv?

### Accurate SQL ###

SELECT MAX("Frequency MHz") FROM table_49240 WHERE "Call sign" = 'k210dv'