Performance of different radio surveys observing a region of 14° × 14°. We simulated the whole radio-emitting volume from z = 0.02 to z = 0.5 and present for both models the radio emission from the ICM+WHIM (blue) or from the WHIM only (red), distinguishing the total emission (large squares) and the one detected by each survey configuration (small diamonds). All emissions have been rescaled by (110 MHz /ν [MHz]) for better comparison of surveys at different frequencies.