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RadioReference.com Forums
One question on your stationary "below LF equipment":
My problem living in the 3rd floor is having no good or no RF ground.
For HF and above there are DIY or ready to use virtual ground devices like the MFJ-931, which will possibly help a bit.
I didn't find a solution for a virtual ground or other DIY project for e.g. VLF.
What do you use for these low frequencies as RF ground?