I think I have found the source of interference to WLOS, real channel 13. It is from WYRD FM, which is very close to your location. I don't have your exact address, but this is the FM Fool report I did from an estimate of your location (report also in attachment):
http://www.fmfool.com/modeling/tmp/e...9/Radar-FM.png
You can do your own report here:
http://www.fmfool.com/index.php?opti...pper&Itemid=29
WYRD is probably causing fundamental overload and its second harmonic falls right in the middle of CH 13.
WYRD FM 106.3 MHz x 2 = 212.6 MHz
CH 13, 210 to 216 MHz
You will need an FM filter or two in series, and you must ground the coax with a grounding block connected to the house electrical system ground to reduce interference.
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 which will tend to discourage a strike, but the system will not survive a direct strike.
FM filter, use one or two in series:
https://www.antennasdirect.com/store...on_filter.html
A HLSJ, HI & LINE ports, can also be used as an FM filter:
http://www.solidsignal.com/pview.asp?p=zhlsj
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Did some aiming and got way more channels than with the indoor antenna but 13 is still useless. It does pick up channel 7 perfectly which is weird since it is also VHF and I found out the antenna I tried is UHF.
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Channel 7 has 25.7 kW ERP at your location, but channel 13 has only 7 kW ERP.
http://www.tvfool.com/?option=com_wr...dALLTV%26n%3d6
http://www.tvfool.com/?option=com_wr...ALLTV%26n%3d14