it should be a rf choke:
A choke is an inductor designed to block (have a high reactance to) a particular frequency in an electrical circuit while passing signals of much lower frequency or direct current.
just my two cents: I think people forget reason we really choose the high wattage power supply, it is for the high current output ability, for example, I have a corsair 520 watt supply, and my pc only need 250 watt on 3d mark 6 test( cpu and video card on full load), but same test will crashed...
you can't use two antenna on one output, the impendance mistach will kill performance, typical antenna will not help your problem, you need a signal booster or signal amplifier( both way)