workers dug out deep concrete bases to secure the towers under the guidance of the engineer j. l. miller. constructed of steel, the station cost $300,000 to build. kgh used synchronous rotary spark gap transmitters. a 3 kw set for close ships and a 5 kw transmitter for ships far out at sea. a receiving set was installed on top of "the board of trade" building in portland, oregon. transmission lines were placed between the hillsboro transmitter site and federal's portland offices.