What is the coverage of relay 5kw of dyfj-tv?
create table table_12379297_1 (coverage__transmitter_site_ varchar, callsign varchar, station_type varchar, power__kw_ varchar, PRIMARY KEY (coverage__transmitter_site_))
select coverage__transmitter_site_ from table_12379297_1 where station_type = "relay" and power__kw_ = "5kw" and callsign = "dyfj-tv"