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Airband:
PolAir 131.6
Sydney Tower 120.5
Sydney Tower 124.7
Sydney Director 126.1
Sydney Director 125.3
Sydney Departure 129.7
Sydney Departure 123.0
Sydney Clearance 127.6
Sydney Clearance 133.8
Sydney Approach 128.3
Sydney ATIS 112.1/126.25
Flightwatch 121.1
Sydney PRM 133.95
Sydney PRM 119.45
Sydney Terminal 135.1
Sydney Approach 124.4
Sydney Departures 118.4
Sydney Ground 121.7
Sydney Ground 126.5
Sydney Approach 135.9
Sydney Approach 363.8
Wollongong CTAF 127.3
Virgin Ground to air 131.2
Tiger Ground to air 128.975
Virgin ground to air 136.9
REX ground to air 135.55
Airsupport 130.3

Company freqs:
Airport Staff 474.225 131.8Hz
" " 474.75
" " 473.4
Air fuel 471.25
Sydney Patrol 471.725
Airsupport 506.5 107.2Hz
Jetstar 508.15
Jetstar 506.475
Jetstar 507.1
Virgin 506.8 136.5Hz
REX 505.2625 151.4Hz
Virgin 490.2 127.3Hz
Virgin 467.15 123.0Hz
Virgin 463.25
Virgin 506.2625

Thanks to JAFO for his freq list.

Sydney Clearance 127.6

127.6 can be used for a number of applications at the airport.
Can be used for the tower to talk direct to an aircraft about something in particular, for instance.

Recent Jeppesen aviation charts of Sydney [zipped .pdf]

Regards,
Rene