How many locations have the call signs dxjp-fm? 
CREATE TABLE "sbn_mom_s_radio_stations" (
  "branding" text,
  "callsign" text,
  "frequency" text,
  "power_k_w" text,
  "location" text
);
SELECT COUNT("location") FROM "sbn_mom_s_radio_stations" WHERE "callsign"='DXJP-FM';