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Before considering a different antenna, it would be wise to first determine why your existing equipment is not getting the job done. Based on your TVFool plot and the equipment list, your equipment is perfectly suitable for your area.
What floor are you on?
Does your balcony face Mt Wilson (NW)?
What is in front of the balcony (buildings, trees, doghouse, etc)?
Are the antennas above any metal railings?
Are you using the combiner provided with the C5 to combine the two antennas then feeding the signal into the pre-amp?
Who advised you to install the two filters and why?
Where are they installed and do they make any difference?
When the two antennas are used in tandem and properly combined, the C5 would have the job of getting channels 7, 9, 11, & 13 while the C4 would be expected to get everything else. If used individually, the C4 would likely suffer on 7-11 while the C5 would most likely suffer on everything else. There may be some crossover, but it is not predictable.
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