CREATE TABLE table_204_270 (id DECIMAL, "transmitter" TEXT, "kw" DECIMAL, "bbca" DECIMAL, "bbcb" DECIMAL, "d3&4" DECIMAL, "sdn" DECIMAL, "arqa" DECIMAL, "arqb" DECIMAL, "pol." TEXT, "a.g." TEXT)

name the only relay with a bbcb over 55 ?
SELECT "transmitter" FROM table_204_270 WHERE "bbcb" > 55
SELECT "transmitter" FROM "table_204_270" WHERE "bbcb" > 55