Calling the University of Miami's WVUM-FM (90.5) uneven is being more than charitable. One minute you're listening to a blistering set of drum and bass, the next you're being aurally assaulted by frat boys and giggling freshmen. Such are the consequences of WVUM's unfortunate charter, which bars not only community members but UM's own graduate students from joining the air staff. Accordingly, with the average DJ's age being nineteen, it's not surprising there's such a lack of depth in the station's lineup. Which makes Suburban Harmony Joyride such a surprising treat. From 7:00 to 10:00 a.m. Mondays, hosts Roy Silverstein and Tom Wilson romp through a gracefully un-Catholic sprawl of underground rock and postpunk squall. The duo may be young, but they maintain a vision that extends far beyond the campus dorms. Recent on-air faves such as Tortoise, Built to Spill, and Eric's Trip, may not yet be familiar to Miami clubgoers, but at least everyone has a regular reminder about what they're missing.