Stereo Install Help

[gsfan74]

Hi, I have started my stereo install on my 99 gs300 and have run into my first problem that i cant seem to find the answer to. I am bypassing the factory amp using the toyota harness that is shown here on this forum,from the 2 plugs i have ran all my speaker wires to the boot ,where i will be putting my 5 channel am at,replaced all door speakers and installed a double din pioneer in the dash. I am having trouble locating the power antenna wire to hook up to the radio. Amy help with this problem would be greatly appreaciated. Thanks in advance,Jake.