Atunci cînd antena este înaltă şi bine degajată, se poate încărca uşor cu sarcini electrice din atmosferă sau chiar poate fi lovită de trăsnet. De aceea, apare nevoia folosirii unui comutator de antenă (fig. 10 a), montat între antenă şi priza de pamînt, sau a unui bec cu neon, montat între antenă şi priza de pamînt (fig.10 b), capabil să asigure trecerea unui curent de cîţiva zeci de miliamperi, în cazul apariţiei unei tensiuni periculoase, care provoacă aprinderea tubului.
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