TV antenna signal strength is measured in noise margin (NM)(dB). Alternatively this can be caste in terms of power (dBm). NM(dB) measurements essentially tell the user how ‘clean’ the signal is by quantifying the amount of residual static not associated with the broadcasted program that is included in the overall signal. NM(dB) is important because a station directly across the street from your antenna could be broadcasting with inferior or damaged equipment causing your reception to appear ‘snowy’ and to ‘flutter’. Proper measurement of NM is essential to optimise the performance of your system. This is something that The Installers TV Antennas Perth can help you with if you are considering an installation, upgrade or repair.