I said 'more useful,' not 'the only useful' and it is because of antenna size. A 1/4 wave antenna at 450 MHz is around 16.65 cm long, and a 1/4 wave antenna at 700 MHz is around 10.7 cm long.
To optimize a low power device, you need to optimize the antenna. So you target a narrower slice of the UHF Television band. If you want to hide the antenna inside of a device, why not choose the smallest antenna?
John----- Original Message ----- From: "Craig Birkmaier" <craig@xxxxxxxxx>
I'm not sure why John thinks only the upper channels are useful - I would think that ANY UHF channel would be useful.
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