For the most common type of antenna the dipole the high voltage point is the ends of the antenna.
Attic dipole antenna.
Dipole and long wire antennas can also be used with mobile outdoor style auto tuners feeding them in an attic space.
Antennas in the attic are a fire hazard this is one of my most favorite excuses because the factual case of a fire hazard is nearly impossible to make.
This was installed at a previous qth i will be the first or millionth remember i m from fl to affirm that the antenna is the determining factor for success when it comes to one s station set up.
The rf losses are fairly low in wood and most roofing at hf vhf most of problem comes from interaction with electrical wiring and ductwork.
Attic antennas can work better than you might think some of mine work as well as their outside counterparts no i m not comparing to a 150ft tower big yagis.
Another local uses an hf loop antenna tacked up around the circumference of the ceiling of a second floor bedroom.
The better your antenna the more success you will have making contacts.
With his antenna matching unit providing an acceptable match he s on the air making contacts.