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Google shopping search for "7 to 51 antennas"
However, I suspect that some of these models may actually be 7 to 69 antennas that are being advertised as "7 to 51".
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Your suspicion is correct since CM has not rescaled their antennas.
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However, why does rescaling for 14-51 cause the antenna to become ~20% larger.
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In general, rescaling moves the peak of performance down-frequency from the old peak frequencies. The lower frequencies require elements that are physically longer to be resonant in the narrower design performance band. The higher frequencies, which now no longer need to be supported, were what necessitated the smaller elements and what usually cause the rapid peaking of gain at the high end of the scale. The narrower bandwidth also allows a more efficient design as demonstrated by the ClearStream product line.