Antenna questions

I recently purchased a Vertex Standard VXA-150 handheld radio for use in my
(wood frame) Pietenpol. I am now trying to determine what antenna would be
best to extend my range. Would likely see a substantial difference in range
between a ground plane antenna dipole antenna such as the Advanced Aircraft
Electronics 5T antenna?

I'm also really interested in building my own antenna. I need to do some
reading on this, but wouldn't mind having the opinion of a few of you guys.
I am an Electrical Engineer, but antennas are far from being my strong
point. How difficult would it be to construct my own dipol antenna? Is it
as simple as running coax to two conductors of the proper length placed end
to end? I do intend to do some of my own research on this, but I would like
to know what kind of real-world results some people are getting. If anyone
wants to point me towards any good sources it would be much appreciated.

Thanks!

Steve Ruse
Dallas, TX