Digital Channel frequencies
Due to the difference in wavelength for UHF and VHF indicators, VHF broadcasts need a bigger antenna for smooth reception. However, VHF signals are easier to receive through obstacles eg woods or huge poles. VHF diffracts around these hurdles and comes in at 40 % signal, while UHF can just only manage 10 percent sign in the same circumstances.
Many digital tv channels in the usa now make use of UHF, but there are a number of VHF channels. Since electronic television creates a photo that is either perfect or empty, you will need to buy the correct antenna for all offered networks.
Channel two in North America has a wavelength of around 5.5 meters, whilst the cheapest UHF station has actually a 64-centimeter wavelength. Effective VHF antennas tend to be as long as 3 yards, while a comparable UHF antenna is 1 meter. Modern roofing antennas have actually a smaller sized Yagi put into front side of a bigger log-periodic, providing both UHF and VHF-high indicators.Find out more about Television & Video
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I don't have cable or satellite, we hooked outdoor antenna up and have had great reception but not now, WHY!!? | Yahoo Answers
ever since television stations went digital we have had our televisions hooked up to an outdoor antenna and have gotten great reception until about two weeks ago now we have no signal, why has this happened and can we do anything to correct it???
Check the cable. You may have had a hungry rat or squirrel chewing on your wires. If that doesn't reveal any problem, plug the antenna input into a different TV and see if that works. If so, it's your TV. If not, it's the antenna or cable. If the first two fixes don't work, try running a second cable from the antenna to the TV to completely bypass the original cable. Finally, verify that the antenna is positioned properly and didn't get blown off line or something.