▁helps ▁to ▁capture ▁we aker ▁received ▁signals ▁than ▁if ▁the ▁receive ▁anten na ▁were ▁lower ▁of ▁the ▁two . ▁By ▁splitting ▁the ▁received ▁signal ▁from ▁the ▁anten na , ▁many ▁rece ivers ▁can ▁work ▁satisf actor ily ▁from ▁a ▁single ▁anten na . ▁Dev ices ▁called ▁receiver ▁mult ic ou pl ers ▁split ▁the ▁signal ▁from ▁the ▁anten na ▁into ▁many ▁receiver ▁connections . ▁The ▁mult ic ou pler ▁ampl ifies ▁the ▁signals ▁reaching ▁the ▁anten na , ▁then ▁fe eds ▁them ▁to ▁several ▁rece ivers , ▁attempting ▁to ▁make ▁up ▁for ▁losses ▁in ▁the ▁power ▁div iders ▁( or ▁split ters ). ▁These ▁operate ▁similarly ▁to ▁a ▁cable ▁TV ▁split ter ▁but ▁must ▁be ▁built ▁to ▁higher ▁quality ▁standards ▁so ▁they ▁work ▁in ▁environments ▁where ▁strong ▁inter fer ing ▁signals ▁are ▁present . ▁ ▁On ▁the ▁transmit ter ▁side , ▁a ▁second ▁transmit ▁anten na ▁is ▁installed ▁somewhere ▁below ▁the ▁receive ▁anten na . ▁There ▁is ▁an ▁elect rical ▁relationship ▁defined ▁by ▁the ▁distance ▁between ▁transmit ▁and ▁receive ▁anten nas . ▁A ▁des irable ▁null ▁exists ▁if ▁the ▁transmit ▁anten na ▁is ▁located ▁exactly ▁below ▁the ▁receive ▁anten na ▁beyond ▁a ▁minimum ▁distance . ▁Al most ▁the ▁same ▁isol ation ▁as ▁a ▁low - grade ▁du plex er ▁( about ▁− 6 0 ▁de ci b els ) ▁can ▁be ▁accomplished ▁by ▁installing ▁the ▁transmit ▁anten na ▁below , ▁and ▁along ▁the ▁center line ▁of , ▁the ▁receive ▁anten na . ▁Several ▁transmit ters ▁can ▁be ▁connected ▁to ▁the ▁same ▁anten na