Edimax Technology EA-ID6D - Manual (Page 4)

WANRING:
Please make sure that the antenna(s) on your wireless devices can be
‘unscrewed’ easily from the antenna connectors.
PCI adaptor for desktop PC
Normally the host of your desktop PC will be remained under the desk or next
to the walls and partitions; such deployment environment might block wireless
signal routes and sometimes cause bad link quality. The directional antenna
with 1 meter extension cable which generates directional signals, you can
point the antenna to where the wireless base station is in order to pick up the
better connections and link quality.
Remove the default antenna from the desktop PCI/ AP/ Router if you need
wide directional signal coverage than the omni directional antenna.
QIG-ED-2406-V1 4