a master antenna controller system is provided . in one example , the master antenna controller system comprises a handheld wireless device and a ret master . the handheld wireless device may comprise an android os or ios based smartphone or tablet that includes wi - fi capabilities communications capabilities . the ret master may provide full ret control based on the aisg 1 . 1 and 2 . 0 standards and communicate with the handheld wireless device via a wireless access point , such as a wi - fi server . the combination may be configured to provide extensive , screen - guided , intuitive ret diagnostics functionality . the ret master itself may also include multiple different pre - defined tests and also some standard electrical tests , e . g . measuring voltage , current etc . additional higher - level functions may be provided on an application on the handheld wireless device and communicated to the ret master wirelessly or by usb connection .