YIKES....I'm surprised to see it working at ALL, being only a few miles from your Local Towers. Intermods must not be affecting ALL of your Weak Signals, but I'm sure it's VERY BAD. With EXTREMELY HIGH INPUT SIGNALS (e.g. -12 dBm PLUS Antenna Gain of ~ 16 dB in Super G-1483 = ~ + 4 dBm), the Intermodulation Distortion Noise will overwhelm Weak Signals using RCA TVPRAMP1 [Max Input = -35.4 dBm for 67 dB Max SFDR]. Although expensive A-D Juice Preamp has MUCH higher Overload Resistance (Max Input = -21.3 dBm for 81.7 dB Max SFDR), it ALSO will be Severely Overloaded. [SFDR = Spurious Free Dynamic Range = Difference between Max Output Signal and Max Noise Floor] Per Actual Preamp/DistroAmp Overload Measurements by Calaveras:
Why are you using a PREAMP??? Have you tried it with the PREAMP REMOVED [you can't just remove DC Power]. If it turns out that you NEED some Amplification to drive say 8 or more drops, then you would be better off using inexpensive CM341x Series Distribution Amplifier [Max Input = -21.6 dBm for 81.9 dB Max SFDR]....and you should ALSO insert some additional ATTENUATION on it's INPUT [Downlead provides perhaps a couple dB Loss]. For each 1 dB of Input Attenuation, the Third Order Intermods are reduced by 3 dB....hence 3.5 dB Loss (e.g. try inserting an extra RF Splitter on DistroAmp's Input) results in reducing Intermods by 10.5 dB, a Net SNR Gain of 7 dB)....and YOU might need as much as 10 dB Input Loss [Net SNR Gain of 20 dB] since you are TRYING to receive some of those Out-Of-Market Dayton Stations in TVFool's RED Zone.
Changing to a 4-Bay vs Super G-1483 will reduce Antenna Gain mid-band by only about 2.5 dB....which reduces Intermods by 7.5 dB, a Net SNR Improvement of only 5 dB. Compare Modeled Results for Super G-1483 vs CM4221HD):
Modeled Performance for A-D DB-4e and CM4221HD are essentially the SAME....and we don't have detailed info (or measurements) for any other current 4-Bay (e.g. inexpensive Solid Signal HDB-4X likely ALSO has about the same Gain):
UHF CM4221HD (Hacked) - 16 ReflRods
[NOTE: Balun Assembly flipped for more Separation from Feedlines]
CM4221HD Hardware Hacks - Page 15 - Canadian TV, Computing and Home Theatre Forums
One other Issue: Back in 2007, Low-Rez CECB's (Coupon Eligible Converter Boxes) were REQUIRED to meet fol. Spec. Requirements, which are probably "typical" Minimum Operating Conditions for later model DTV's and OTA STB's:
In NON-FADING Bench Tests, Adjacent Channels as Strong as 33 dB MORE than the Desired Channel "should" be tolerated [e.g Strong Ch29 vs Weak Ch30 for FOX]. And "TABOO" (N +/- 2) Next Adjacent, [ e.g Strong Ch24 and Ch28 vs Weak Ch26 for CW] as Strong as 44 dB MORE "should" also be tolerated. In the REAL-WORLD, the weaker Channels would be suffering from Multipath Fading, whereas the Strong Local LOS Channels would NOT....so I would expect to see Adjacent Channel ISSUES when only about 20 dB Stronger and Next Adjacent Channel ISSUES when only about 30 dB Stronger.
In YOUR Case, Ch29 is 71.6 dB Stronger than FOX on Ch30. And Ch24/28 are 64.9 dB & 64.6 dB Stronger than CW on Ch26. Super G-1483 Antenna Pattern provides only about 10 dB suppression of Ch28 and since they are only Separated by about 36-deg, perhaps 10-15 dB Suppression of Ch24 if you carefully Tweak the Pointing Angle. So I'm very surprised to see that you successfully Receive THE CW on Ch26.....and changing to 4-Bay with provide better suppression of Ch28, however the Wider Beamwidth will make this situation WORSE for Ch24 Suppression vs THE CW on Ch26.
Mounting the Antenna so that there is SOMETHING between it and your Local Stations can help to suppress those Extremely Strong Signals (such as your House). Adding a LARGE Wire Mesh Screen could also help. And using a specially built DIY Antenna with a DEEP NULL in the Rear Antenna Pattern would help the MOST. I need to do some additional research and perhaps Re-Optimized some Designs before I can recommend anything.....such as fol. PAIR of VERTICALLY Stacked 91XG Yagi's [I NEED to do some RUNS for HORIZONTALLY Stacked 91XG's...and perhaps OTHER, SMALLER UHF Antennas]: