CREATE TABLE table_28634 ("Channel" FLOAT, "Channel name" CLOB, "Callsign" CLOB, "Signal power" CLOB, "Broadcast area" CLOB)

What is the signal power for JOAB-DTV?
SELECT "Signal power" FROM table_28634 WHERE "Callsign" = 'JOAB-DTV'
SELECT "Signal power" FROM "table_28634" WHERE "Callsign" = 'JOAB-DTV'