On using a metal roof as an antenna the joints between panels are likely not soldered and are likely to form corroded diode junctions that generate rfi.
Flat panel antenna metal roofing.
Any big hunk of metal is worth a try though.
If your attic is accessible and you don t have a radiant heat barrier or metal roof you can also try installing an outdoor tv antenna within your attic.
For example if you place your antenna in a window but there are metal burglar bars or a metal bug screen just outside the window this could cause issues.
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If i were to consider installing a vertical antenna on the top of your sunroom i d make absolutely sure that all of the metal roofing panels are screwed together to prevent a diode effect to prevent re radiation.
For outdoor tv antennas the best locations are on your roof or garage.
4 keep the antenna away from any metal.
The higher you can get the antenna either inside our outside of your home the better your tv reception will be.
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Metallic surfaces near your antenna can cause interference with the digital signals and block your reception.
Trees and foliage does not affect the hf bands like it does on vhf uhf.
Setup is as easy as you d expect with the most difficult part being the aiming and cable routing to your tv.
The term flat panel implies thin to me but in the case of this antenna it merely means that the antenna is not the ungainly tiers of metal that one might be used to with other outdoor antennas.