What do we gain from 6dF?
A LARGE data set of radio-source spectra over a SMALL redshift range (no evolution).
Total volume (to z=0.04) ~ 2x107 Mpc3
All-sky radio surveys (NVSS/SUMSS) with detection limits of 2-5 mJy at 1400/843 MHz typical
radio powers of 1021 - 1025 W/Hz in 6dFGS volume
The deepest current radio surveys (to 10-50 mJy in
HDF N and S) 1022 - 1025 W/Hz at z=2 - 3