Edimax Technology QIG-ED-DB-0507-V11 - Manual (Page 11)

If you have poor link quality with your current default antennas on the wireless
devices such as AP/ Router/ PCI adaptors, please remove the default antenna
or the low performance antenna which is bundled with the products.
Recommendation:
To purchase another external antenna to connect both the base station and the
client user, the signal could be received and transmitted better than just
connect one.
QIG-ED-DB-0507-V1 11