Actually, Alfredo, KSVU’s pattern is non directional. The propeller shape is a result of topography. The ERP though, is indeed set by the international co channel in Burnaby.
I played with a directional antenna to try and increase coverage but Burnaby limits any further coverage to the west towards Sedro-Woolley where the 60 dBu could hope to pick up population count (very important in NCE competitive applications), but the only direction more power and a directional antenna would pick up had negligible pop count (southeast).
The propeller pattern is the result of having to put the transmitter on the side of the steep slope just north of Hiway 20 a few miles west and slightly north of Concrete, WA. There were few options. It does give the college coverage in the valley that runs east west where some reasonable amounts of population actually live.