@teleview, I'm all in favor of adding KCWX to the lineup...
The AP3700 covers all of the VHF band, CH-2 through CH-13, which is fine in this case... there aren't enough other strong VHF signals to cause a problem. The only reason to use the CPA-19 with HLSJ filters is that it narrows the bandwidth to real channels 2 through 6. Low cost and simplicity argue for the AP3700.
I'm not following your math though,
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With the HD7084P antenna at 30 feet that makes 14.4 NM(dB) for channel 5 and a antenna gain 7.4 NM (dB) at channel 5 , that makes 21.8 NM(dB) a respectable number.
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I calculate a net NM value that's much different... The NM shown for KCWX, CH-5 in the 30' TVFR is 11.6 dB, not 14.4 dB. The 13 dB correction factor I use is neither overly optimistic nor pessimistic. The 6 dB tuner NF may be a bit optimistic, and 0 dB distribution losses is obviously beyond optimistic. The Net NM of 3.4 I've calculated becomes negative when I plug in the losses of 100' of coax plus a 4-way split, certainly when I use a more realistic tuner NF.
@Cabal, I have no doubt that if you install the HD7084P, you'll enjoy great reception of a lot of signals. Given the relatively small difference in price between the CS2V and the HD7084P, go with the 7084... it's the only way to have a chance at seeing the signal from KCWX, real CH-5. If you have some difficulty with that one station, it would be because of it's low signal level at your location and the presence of additional noise in the low-VHF band (CH-2 through CH-6). Additional height would be one of the few remaining options to pursue if you found reception of the KCWX signal unreliable.