Hi everybody! I want to mount a dipole FM antenna on top of a three
story building. My transmitter will be located in a room in the bottom
floor. Has anyone have experience in this?

I know that I will get some signal attenuation with that long of a
coaxial cable (100 meters). If my cable has a characteristic impedance
of 50 ohms (matching the output impedance of the transmitter), will it
adversely affect my transmission?

I was reading my electromagnetics book and it mentions that depending
on transmission line length the cable might look like an inductor or
capacitor.

What other factors should I take into account my calculations for the
effect of the cable length on the system?

My current setup includes a 100w low power fm transmitter being fed by
a computer running some school audio programs. Thnx!