Welcome, icunmypc:
The preamp of the Lava was probably overloaded by your strongest signals.
I suggest you try the Antennas Direct C2V antenna, no preamp.
The loops will pick up UHF channels, real channels 14-51. Aim north.
The dipole will pick up VHF-High channels 13, 11, and 9.
Use the TiVo diagnostics screen to monitor signal strength, SNR, and uncorrected errors to help you adjust the antenna.
If the antenna is outside, the coax shield should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety and to reject interference. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge, but the system will not survive a direct strike.
You have some strong local FM signals that might interfere with TV reception.
http://www.fmfool.com/modeling/tmp/d...5/Radar-FM.png
If so, insert an FM filter in the coax.
http://www.mcmelectronics.com/produc...-FM-88-/33-341