Most Power Mac G5 computers include at least one external antenna, for AirPort. You also receive an antenna for Bluetooth if you ordered that configuration. You can identify antennas using the pictures presented here.
Power Mac G5 (Late 2005) models have their AirPort and Bluetooth antennas integrated into the enclosure, and do not use the external antennas described in this article.
AirPort antenna
The AirPort antenna, shown below, is shaped like a capital "T" . Once connected, it can be rotated to provide the best signal to the computer.
Bluetooth antenna
The Bluetooth antenna, shown below, is a small cylindrical antenna that provides reception for Bluetooth devices.
Warning:The FCC rules require that the operator or a nearby person be more than one centimeter (0.4 inches) away from the AirPort Extreme antenna during transmission. In addition, the AirPort Extreme antenna must not be co-located with any transmitter or antenna other than Apple Bluetooth antenna model A1067.