Canon WFT-E7 Instruction Manual page 126

Wireless Function Notes
Notes for Using Multiple Wireless Transmitters
When multiple cameras with a wireless transmitter attached are

connected to one access point, make sure that the cameras' IP
addresses are different.
When multiple cameras with a wireless transmitter attached are

connected to one access point, the transmission rate drops.
When there are multiple IEEE 802.11n/g/b (2.4 GHz band) access

points, leave a gap of four channels between each wireless LAN
channel to reduce radio wave interference. For example, use
channels 1, 6, and 11, channels 2, 7, and 12, or channels 3, 8, and
13.
When IEEE 802.11n/a can be used (on the 5 GHz band), switch to
IEEE 802.11n/a (on the 5 GHz band) and specify a different
channel.
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