Ah, the luxury of having a 1/4 wave tower/antenna for 160....
I'in a street, row of houses, people are used to big antenna's here by now, but there is always a thin line...
The vertical L will be strengthened and will go up to 23 meters, the rest sloping down to 8 meters above ground.
ON4UN book, as well the ARRL and RSGB antenna books, as ARRL handbook have lots of material on this, also on the net you can find good stuff.

http://wadsworthsales.com/Documents/...ION%202008.pdf
http://www.lbagroup.com/internationa...protection.php