A snowy picture indicates that your receiver is not getting enough signal. Possible causes are a large obstruction for example, a hill, a big building or even leafy foliage close to your antenna and between Mt. Dandenong. If this is the case it may help to find a new location for the antenna on your property, alternatively a higher performance antenna or a masthead (booster) amplifier may help overcome these problems. However such an amplifier may cause the installation to be more susceptible to local interference.
[insert Google Map here]