The layer of plywood would tend to block those.
Grounding antenna in attic.
From your description it sounds as if you may create a ground loop which may cause problems throughout the house.
Most people use a galvanized steel ground strap such as this one.
It might not but there is going to be a whole bunch of electrical wiring in the attic as well for the lightning to follow.
Now it s time to ground your tv antenna s coax cable.
Neither apply to an antenna in the attic.
This antenna has all the reception power of an outdoor antenna but features a curved metal frame of reflectors that are designed for fitting easily into smaller attic spaces.
Check to ensure that the vent tube is firmly grounded before connecting the wire.
There are very specific requirements for grounding an antenna both via mast ground and a shield ground.
Step 4 how to ground your coax cable.
Grounding a tv antenna isn t just for safety.
To bond a grounding wire to the antenna mast you can use either a ground strap or pipe clamp.
The copper wire at the base of the antenna mast attaches to the copper vent tube that runs to the roof through the attic in a 55 year old house.
Clearstream 4v hdtv antenna.
An example is the 90628 ground pipe clamp by morris products.
Here are some photos of my roof top antenna with a grounding wire in the attic.
It eliminates noise caused by static discharges from the antenna through the receiver.
Air movement in your attic should not pose a problem.
An alternative is a pipe clamp which is heavy duty and made of steel with serrated adapters.
Exterior antennas must have their mounting rod grounded to provide electric discharge in the event of a lightning strike or static accumulation from other causes.