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No, you do NOT need a preamp. There is precious little signal loss in 6 feet, and preamps do not dig signals out of the noise.
Do NOT buy any LAVA product. They are of dubious quality and their designs are more about looks than real sensitivity.
Do not get hung up on mileage ratings. They are an informal way of trying to relate antenna gain to expected performance. Preamplifier gain is often added to antenna gain to extend these ranges, which is incorrect. Preamps preserve an antenna's performance through the feed system.
You have a tremendous height advantage over the average OTA scenario. Notice that you have LOS, or line-of-sight to stations over 70 miles away, which means they arrive at your location much stronger than they would for someone with an antenna 15 feet above ground at the same distance. This is clearly shown by the NM data in your report.
NM, or noise margin, is TVFool's estimate of how the signal level in the air (before antenns are involved) compares to the minimum signal required for reception. We normally recommend aiming for +15dB in order to protect against localized interference and unusual atmospheric conditions. Note that, except for the weakest Buffalo stations, you don't need ANY antenna gain. You simply need to not lose any signal. Consult the Signal Analysis FAQ linked to on your report for more information.
Therefore, as a first step, get a barebones loop/bunny ears antenna that has NO amplifier. If that doesn't work, you could try a Terk HDTVi, the FV-HD-30, or the DB2e. Other opinions are welcome.
Good luck!
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