Get a router that operates in the 5 gig band. I have not used the XD-v75 units yet, but the XD-v70 used in 12 channel (RF1) mode is going to be "problematic" for other wifi devices if you try to operate in 2.4 gig. I use a D-link DIR-815 which works well for me and is reasonably priced. Perhaps the RF2 mode is more accommodating to 2.4 gig, I plan on using 5 gig in any event.
I'm using iLiveT systems, mixing almost totally from the iPad1, and have had almost no issues since switching to 5 gig, (other than a couple of jobs that had extremely concentrated wifi, police & ems usage, and that resulted in some wireless mic dropouts, but no iPad issues (after I "ignored" a slew of sources...)). I have found that my iPad is more responsive when removed from the case it's normally in.
Allen & Heath produced a list of routers they tested with results they found: FYI, only.
If you insatll the new V2.0 firmware in your V70 you will be able to operate in RF 2 mode. In this mode cahnnels for both the wireless mics and for wi-fi operation can be co-ordinated, It is a free download that you can access from our Monkey program, but you must use a V75 receiver as the computer interface. So you will need access to a V75 possible from your dealer. Alternately you can return it to our service department, however there is a charge for labor and shipping.