If it says 468 use that - I forget - been a loong time -
as for placement - we just tacked it to the ceiling-at one end - then kept moving the other around until the signal picked up - then tacked the other end in place.
hope it helps -
ps phone line - no - rigth at the wall - the conductive line through the house and out to the first break gives you your antena. - we did make one that was 100 yds long - it was a bugger of you rolled it up wrong LOL
wizofid