From the
Mythbusters files:

WIRELESS PERFORMANCE
AFTER FEBRUARY 2009

FALSE at present.
Likely TRUE in the future.
There is a proposal from the FCC that disallows the use of wireless systems in the 700 MHz range, potentially as early as February 17, 2009. It has not yet been mandated, but it specifies that equipment in this range not be used after the DTV transition date. That could mean effective February 17, 2009 or over a specified transition period.

Because new users will eventually occupy this range - telecommunications operations and public safety operations – equipment in this range may become unusable over time.

Breaking News

Recent legislative action at the Federal level may delay the DTV transition date until June 12, 2009. Nevertheless, operation of wireless systems in the 700 MHz range (698-806 MHz) will eventually be phased out as part of this transition. It is recommended that concerned wireless system users check the FCC website or the Shure website for updates on the DTV transition.

FALSE.
This is still a common myth.
Some users believe that if they have equipment from Shure and another manufacturer, they needn't be concerned with frequency interference or frequency coordination because each manufacturer has its own special frequency.



This is untrue. All manufacturers share the same common frequencies; none own a specific frequency band. When coordinating multiple wireless systems, you need to be aware of the actual frequencies, not the name of the manufacturer.

A good frequency-agile system will tune over the widest possible spectrum of the UHF band. The wider the tuning range, the more likely that the user will be able to find clear frequencies to use. For example, the least expensive systems tune over a narrow band of 12 MHz. The most advanced can tune over a range of 60 MHz or more, so there's a clear progression of tuning ranges as you move up the food chain – that's especially important for customers who are using multiple wireless systems or are touring.