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Don't place any antenna in front of another. There is no maximum separation distance other than the practical limit of cable length. The minimum separation would be about 3', more is better.
If I were to list the H-VHF antennas in order of gain, the Y10713 would top the list. The CS5 spec of 7.6 dBi converts to about 5.5 dBd. (The Y5713 is spec'd at 6.9 dBd and the Y10713 has 9.4 dBd gain per the manufacturer.)
Given the trouble you've had, I'd suggest you use the most gain that will fit in the space (while still being able to aim and clear other metal objects.)
By the time you pay for shipping, Radio Shack is as good a source as any for a UHF/VHF combiner for use in an attic.
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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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