▁use ▁to ▁communicate ▁with ▁their ▁families ▁back ▁home ▁in ▁the ▁States ▁via ▁short ▁wave ▁radio . ▁ ▁For ▁local ▁area ▁communic ating ▁– ▁for ▁example , ▁when ▁in ▁the ▁As c ension ▁Island ▁area ▁in ▁the ▁Atlantic ▁or ▁the ▁John ston ▁Island ▁area ▁in ▁the ▁Pacific ▁– ▁the ▁D AMP ▁vessel ▁had ▁the ▁cap ability ▁of ▁transm itting ▁and ▁receiving ▁USB ▁voice ▁and ▁L SB ▁radi ote let ype ▁to / from ▁such ▁island ▁locations . ▁The ▁D AMP ▁ship ▁could ▁also ▁communicate ▁with ▁aircraft ▁and ▁nearby ▁islands ▁using ▁various ▁V H F ▁or ▁U H F ▁radio ▁configurations . ▁ ▁Vari ous ▁anten na ▁were ▁employed ▁to ▁obtain ▁maximum ▁range ▁from ▁ship - to - sh ore . ▁The ▁U H F ▁trans ce iver ▁used ▁a ▁dis con e , ▁while ▁the ▁V H F ▁trans ce ivers ▁used ▁ground ▁plane ▁anten nas . ▁The ▁ 1   k W ▁H F ▁transmit ter ▁used ▁a ▁rem ot ely ▁tun ed ▁ ▁wh ip ▁anten na , ▁while ▁the ▁ 3   k W ▁H F ▁transmit ter ▁used ▁a ▁vertical ▁c age ▁anten na ., ▁and ▁the ▁ 1 0   k W ▁transmit ter ▁employed ▁a ▁dis con e ▁anten na . ▁The ▁vessel ▁contained ▁numerous ▁state - of - the - art ▁rece ivers , ▁which ▁were ▁fed ▁from ▁an ▁anten na ▁distribution ▁system ▁from ▁three ▁ ▁wh ips . ▁ ▁The ▁D AMP ▁ship ▁also ▁carried ▁advanced ▁crypt ographic ▁equipment ▁which ▁could ▁be ▁used ▁to ▁encode ▁or