Abhishek,
The trees will affect your signal to some small
extent, but so do the buildings around you and the
one you are living in. By the sound of what you
are hearing, it doesn't seem like the trees, buildings,
or whatever, are causing you any real problems. Unless
those strong signals are noise, in which case, those
trees are the ~least~ of your worries.
The 'ideal' location for an antenna is high above
ground and far from any surounding structures. Very
few people have 'ideal' antenna locations, almost all
are a compromise in some way. Yours doesn't sound
unusual, and since it seems to be working well, I wouldn't
change it (well, at least remember how it's arranged so
that you can change ~back~ to it if you do make changes LOL).
'Doc