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I'll look for grounding but suspect it's unlikely. Does that impact reception, or is this more of a safety issue?
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Both. The dish installer and the antenna installer should have grounded the dish mount and the coax. Grounding the coax can make an interference filter more effective.
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.
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The radio interference filter I got was the RadioShack 1500025--says it eliminates radio interference: Rejection 0~25MHz/30dB, 25~30MHz/35dB. Should I try something else?
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Yes, you should try something else. That filter is used to keep interference out of a video line when you are using a video game, like the Atari 2600. The RS FM trap is 1500024 or the older 15-577, both of which are hard to find. The Antennas Direct FM Trap is available.
https://www.antennasdirect.com/store...on_filter.html
The problem with those filters is they don't cover the whole FM band well, and you have strong FM signals across the whole FM band, but you could put two in series for more rejection if needed.
http://www.fmfool.com/modeling/tmp/8...f/Radar-FM.png
A HLSJ (high and common ports) can be used as an FM filter if you need one. NBC and Fox are the channels most likely to be affected.
http://www.solidsignal.com/pview.asp?p=zhlsj