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It sounds like your are asking, 'Are the antennas currently on the market better than those that were designed and sold more than a year ago?'
If that's a fair summation of your question, I'd have to say, "It depends on which antenna you're considering."
Given that the FCC gave real Channels 52 to 69 to other services (sold the bandwidth actually), there cold be some changes to UHF antenna design. However, few consumer grade antenna manufactures have brought new designs to market thus far.
The Antennas Direct DB2e, DB4e and DB8e are newer designs that concentrate their performance in the range of real channels 14 through 51. As a result, they outperform older designs that covered real channels 14 through 69 or really old designs that went all the way to real CH-83. The performance of these specific antennas is a dB or two better than the older comparable designs.
Though Winegard has a well earned reputation, I have not seen any of their large 'fringe' antennas get a redesign in several years. They still span the RCH-14 to RCH-69 range which leaves a dB or two of UHF gain 'on the table'. The same can be said of the Antennacraft and Channel Master lines. (Even the relatively new Master Piece line of antennas is spec'd to RCH-69)
There are no fantastic leaps in antenna performance on the market... Because the laws of physics have not suddenly changed. The old designs were pretty good, usually with little significant difference between their actual performance and what theory would suggest is possible.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 2-Dec-2013 at 7:19 PM.
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