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Looks like the heavy weather around the radar (centre of image) is blocking the signal from further away.
"Notes
* Melbourne Weather Watch Radar
o Location: RAAF Base Laverton
o Type: WSR 74C C Band
o Typical availability: 24 hours
o Interpretation notes: The radar at Laverton is the primary weather radar for the Melbourne area. It is situated about 60km south of the Great Dividing Range. The highest relevant peak in the Range is at Mt Macedon, 55km to the NNW. Apart from the influence of the Otway ranges to the south, the radar has a good view of echoes to the west and east. Thunderstorm events to the north of the Great Dividing Range are underestimated as the radar beam usually won't see the whole cloud. Rain bands do not normally have the same problem as the echoes are more uniform and the base of the cloud mass is higher in the atmosphere (above the height of the ranges). As with all radar the Melbourne radar has a greater ability to resolve thunderstorms in the summer months when the echoes are generally larger. However being a C Band radar it is limited in its ability to detect thunderstorms located behind closer thunderstorms. On the other hand the C Band radar is better at detecting small drops so performs better in light rain situations. False echoes are sometimes observed very close to the radar especially in stable conditions. Echoes within five or so kilometres of the radar and overhead are poorly resolved as the scanning elevation is too low. (courtesy Bureau of Meteorology)
* Weather radar detects precipitation by using its ability to reflect microwaves back to a receiver. "
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