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Don't get frustrated...it sometimes takes a bit of experimentation to work things out in a signal situation such as yours.
1. I would recommend a 4 ft spacing between antennas to prevent coupling
2. The Stellar Labs 33-2230 combiner specs show an insertion loss of 3.5 dB, while others such as the Pico Macom UVSJ specs show an insertion loss of only 0.5 dB and the Holland UVSJ as loss of 0.7 dB.
3. Did you need the preamp to receive your UHF stations?
4. Try just the UHF antenna with and without preamp and see what results you get
5. Try just the VHF antenna with and without preamp and see what results you get
The answers to points 3, 4 & 5 will help determine what is happening with your installation.
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