If you have no access it s hard for me to tell you to go to extremes to find a way.
Does attic antenna need ground.
In the case of an attic installation your tv antenna will be sheltered from the environment so there s no need to ground it for that reason.
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There are other options listed in section 250 of the nec but the ges is preferred.
The national electrical code nec requires that the antenna mast and the coaxial cable be bonded to the home s ground electrode system ges which is usually the ground rod installed at the power meter and breaker box.
Agreeing with adtech i don t see the nec requiring you to ground an indoor antenna system.
Keep your grounding parts however.
Grounding an attic mounted antenna.
However the connection of your antenna coax to various ac operated equipment in this case your converter box or tv introduces the potential of electric shock.
Attic antenna not doing much.
Grounding an attic antenna.
Typically the house wiring and gutters represent a much lower impedance path to ground for lightning than the floating attic antenna.
But if you have access to a ground connection that can serve the attic splitter it makes sense to use it.
Ground attic antenna through ac ground.
Scanner antenna in attic does it need a ground.
There is no requirement to ground an indoor or attic antenna.
For all practical purposes an attic antenna is considered and indoor antenna and does not require any special grounding.