Wirelessly posted (Opera/9.80 (BREW; Opera Mini/6.0.3/27.2338; U; en) Presto/2.8.119 320X240 LG VN530)
Assuming you have your scanner properly programmed, the simulcast sites for both the RWC and Topaz RWC are notoriously difficult to receive, due to multipath interference issues. At home, you may be best served using an outdoor directional antenna pointed at one of the sites. (And the closest site may *not* be the best site. You may need to experiment with which site you aim your antenna at.)
Otherwise, try programming in just Mesa's Thompson Peak site. I don't know how much traffic is carried on that site, in relation to the simulcast system sites within the cities of Mesa/Gilbert/Apache Junction themselves.