Antena constituind elementul de legatura dintre radioemitator sau radioreceptor si mediul de propagare a undelor electromagnetice, este necesara o cit mai buna acordare a acesteia si o adaptare corecta a impedantei sale cu a liniei de alimentare.
Punerea la punct a antenelor si a liniilor de alimentare poate fi realizata folosind aparatura specifica, relativ simpla, cu care vom efectua masurarile si reglajele necesare.
In acest capitol sint descrise mijloacele practice cu care putem efectua aceste masurari si reglaje, cum ar fi taierea unei linii in jumatate sau sfert de lungime de unda, la lungimea exacta, dintr-un cablu coaxial sau linie bifilara al carui factor de viteza nu este cunoscut, determinarea impedantei caracteristice a unei linii de transmisie, controlul frecventei de rezonanta si al impedantei unei antene, masurari de cimp electromagnetic, curenti si tensiuni in diferite puncte ale liniilor de transmisie etc.
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