Originally posted by jhill
Does the CM 4228 provide VHF? All the signals I need to get right now are UHF but reading the rest of the thread makes me want to have both.
UHF antennas (of which the CM4228 is one) do get some signal on high-VHF stations. They don't get much of anything on low-VHF.
VHF antennas have the disadvantage of being very large due to the longer wavelengths involved.
VHF/UHF combos have the disadvantage of being very large like VHF antennas, and generally have poor UHF performance comapred to a dedicated UHF antenna.
If you're trying to future-proof, a combo might work fine for you. If you just want something that works for HD now and let the future (or distant future, as the case may be) work itself out later, go with the UHF and enjoy the current digital environment.
Average "life" of an antenna is about 10 years, after which they start having serious structural issues, as well as corrosion and other bad effects. They may work, and some last much longer, but that's a good guideline.
It is entirely possible that newer antenna designs will be heavily skewed toward UHF and potentially high-VHF as well, which would be a vastly superior design for what most expect the final digital landscape will look like.