LPGA
From The RadioReference Wiki
Scanner frequency information for the LPGA
As a general rule: radios and cell phones are prohibited items during tournament days at the course. How this applies to scanners I'm not sure--but if you bring a scanner, you must be very discrete.
Tour Frequencies
LPGA radios
BearCom provides the radios used by the LPGA (source).
A Radioreference thread about the radios that the LPGA staff used at 2006 McDonald’s LPGA Championship at Bulle Rock Golf Club in Havre de Grace, Maryland mentions that Motorola HT1000 UHF radios. Likewise, at the 2007 State Farm Classic in Springfield, IL, there were many Motorola UHF radios (some GP300s) with 1/4 antennas in use and the personnel used earpieces.
LPGA frequencies:
For now, the frequencies found at the 2007 and 2009 State Farm Classic have been left under the State Farm Classic section of this Illinois sports page until it can be confirmed which of these frequencies are used nationwide and which are used exclusively at the Springfield tournament. A report from the 2009 Solheim Cup is forthcoming and should shed some light on which frequencies are actually used by the LPGA.
Media frequencies:
Golf Channel and ESPN have been observed using frequencies in the 450 MHz and 455 MHz ranges at LPGA events. More info can be found here.
Event Frequencies
As a result of the collaberation project, all event frequencies have been absorbed into the following articles;