TVWS (TV White Space Spectrum) is unused and lightly-used chunks of spectrum between TV channels spanned roughly 450 MHz - 850 MHz varying from country to country. It is no big set of frequencies, but their propagation is quite good, so fewer base stations are required.
LTE, LTE-A or Wi-Fi could be the air interface, few vendors already are developing TVWS solutions. Heavy reading 4G/LTE Insider prepared the report "TV White Space Spectrum for LTE: It's Free, but Not Cheap". Price: US$900.
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