Method and apparatus for transmitting pilot on multiple antennas are disclosed. A wireless transmit/receive unit (WTRU) may transmit a primary dedicated physical control channel (DPCCH) and at least one secondary DPCCH via multiple antennas using different channelization codes. The first eight pilot symbols of the secondary DPCCH may be same as pilot symbols of length eight of the primary DPCCH. The secondary DPCCH may include a same number of pilot bits as the primary DPCCH in a normal mode and in a compressed mode, respectively. The transmit power of the secondary DPCCH may be adjusted based on a ratio of a number of pilot symbols in the primary DPCCH and the secondary DPCCH. When a required transmit power exceeds a maximum allowed transmit power of the WTRU, power scaling may be applied equally to the primary DPCCH and the secondary DPCCH.