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The simple reality is that VHF antennas have to be larger than UHF antennas to achieve the same gain and directivity. Lower frequencies have longer wave-lengths and therefor the corresponding antenna elements need to be longer. Because you have a mix of UHF and VHF signals, you need an antenna that is larger than a UHF only design.
You have described a situation that is ripe for signal reflection (a source of multipath interference which can cause more trouble than simple signal attenuation) ie. nearby buildings and terrain that block your line of sight toward the transmitters. Eliminating the effects of your own roof is a very reasonable next step. Test reception outside, using the existing antenna.
I wish I could promise you that a particular antenna and location will work... 'for sure'. In fact, you need to test reception at a proposed location, then you'll know what's really there.
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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; 22-Jan-2014 at 2:42 AM.
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