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A legal limit antenna tuner might still arc at much less power than the rating if the impedance of the antenna is low. The wattage rating on the tuner is based on a specific impedance and reactance, which is ideal for the current rating of the capacitors, inductors and switches used in the tuner.A legal limit antenna tuner might still arc at much less power than the rating if the impedance of the antenna system is low. The wattage rating on the tuner is based on a specific impedance and reactance, which is ideal for the current rating of the capacitors, inductors and switches used in the tuner. The antenna and balanced feed line together provide the antenna system impedance specific to a frequency.To determine the tuner's balun impedance: