Its a spire, Its an antenna, Its an architectural decoration!
 
What really is the difference between all these? Maybe we’re all silly and there isn't a difference?
I in fact find it a bit foolish how they are so harshly separated.

Well first, here's what Webster says:

Spire - A structure or formation, such as a steeple, that tapers to a point at the top.

Antenna - An electrical device that sends or receives radio or television signals

So, basically it’s the difference in electrical current! Silly huh? Well, others also debate that a spire is a permanent element on the building while the antenna is not.

Well enough worry, let’s see some examples. Maybe they look different!

Spires

The Petronas Towers (NFS)


The Taipei 101 (NFS)


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Antennae



The CN Tower (NFS)


The Sears Tower