Pole Vault
... that the first troposcatter communications system, Pole Vault , linked Pinetree Line radars along 2,250 km (1,400 mi) of wilderness in Labrador?
... that the first <a href="./Tropospheric_scatter" id="mwBlk" rel="mw:WikiLink" title="Tropospheric scatter">troposcatter</a> communications system, <b id="mwBlo"><a href="./Pole_Vault_(communications_system)" id="mwBls" rel="mw:WikiLink" title="Pole Vault (communications system)">Pole Vault</a></b> <i id="mwBlw">(antenna pictured)</i>, linked <a href="./Pinetree_Line" id="mwBl0" rel="mw:WikiLink" title="Pinetree Line">Pinetree Line</a> radars along 2,250<span id="mwBl4" typeof="mw:Entity"> </span>km (1,400<span id="mwBl8" typeof="mw:Entity"> </span>mi) of wilderness in <a href="./Labrador" id="mwBmA" rel="mw:WikiLink" title="Labrador">Labrador</a>?