Generally, higher is better... all three are edge path shots, prone to varied propagation.
All three are effected by adjacent channel interference... You may need more directivity and / or higher F/B ratio.
KXII is on VHF 12. The U8000 is cut for support of CH 14 and up.
(ADTech types faster than me... but we generally agree  )
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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; 5-Feb-2011 at 5:28 PM.
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