KM, I will have to test a bit more. I have that Shure Digital mic as well and it sits in the shelf due to the cut outs. I think I already tried the 5 GHz only, but will try again. Next wireless mic will be UHF 
This (meaning my comment to follow) is off the topic of iOS 8, but in response to this post...
[soapbox]
As a broadcast engineer in "real life," I fear for the future of UHF wireless mics in the US. The wireless companies (AT&T, Verizon, et al) and the land-mobile communications industry are very successfully lobbying the FCC to get more and more of the UHF spectrum allocated for cell phones and trunking two-way radio equipment (think cellular-like technology) for public safety and law enforcement. That has already resulted in the loss of one of the three UHF bands previously allotted to wireless microphones (800-900MHz bands), and another will very likely be re-allocated in 2015 (600-700MHz band). While some upper frequencies remain available for licensed use, that will leave us a few frequencies in the 500MHz band for unlicensed use. Obtaining a license to operate in the upper bands is expensive and time-consuming. Broadcasters are complaining that this is costing them a fortune in upgrades and re-licensing fees.
Yet, most wireless mic manufacturers are continuing on, business as usual, instead of developing affordable 2.4GHz options. As late as last year, Sennheiser reps refused to believe this was happening, and when talking to folks at Shure, I felt a similar attitude (although they were starting to deliver 2.4GHz options due to customer demand).
The fines for using illegal gear are steep if you get caught -- up to $10,000 per offense. And, it's illegal to sell off gear that's no longer "allowed."
My point -- if you're buying wireless gear, choose carefully to future-proof your investment as much as possible.
I'll get off my soapbox now...
[/soapbox]
