Green Valley is probably 35 miles as the crow flies from KWFM's transmitter site on the far NE side of Tucson. With only 2,000 watts during the day and at a relatively high dial position, KWFM doesn't put a strong enough signal into Green Valley to have an impact. And KWFM suffers from co-channel interference in this somewhat fringe area at sunrise/sunset. I know because I live very near Green Valley and use to listen when it was 1330 the Jolt. KWFM does put a decent signal into Green Valley at night with their directional pattern and power increase; however, everyone is in bed by 7pm
The primary area where KWFM has a competitive signal, day AND night, is to the SW across Tucson - including South Tucson and the SW metro area, an area which is mostly Hispanic.
The only format in Spanish that might get sales, even if it gets no ratings, would be the Univision / Televisa joint ventur, TUDN. Well done, mostly soccer, and on target for Spanish speakers who like only three sports... soccer, soccer and soccer.