[Elecraft] Mast question

[Reuben Popp]

Hey everyone, more of a beginner question here and not [directly] Elecraft
related.

I have a K2 I built some time ago that I paired with a half size g5rv.  At
the time, I was living with a buddy whose house design allowed me to set
that antenna up as a sloper (and it worked quite well).  That said, some
years have passed, I'm married now and the house I live in now is much
smaller.  I have the antenna still, but it's merely laid along the vertex
of the roof.  Reception is so-so, but I know it could be much better.  So,
what can I use for a reliable mast that would be left up all the time?

There's no trees in the lot. The house itself is a single level house on a
slab (no basement). and from end to end it's _maybe_ all of 40'.  The
distance from the ground to the vertex is maybe all of 16 feet (or there
abouts).

The XYL said she doesn't want guy wires all over and a rohn style tower is
out of my budget.  I'm looking for suggestions that's preferably < $300, if
possible.  The locale is mid-east Missouri, about an hour outside St.
Louis; storms come and go but it's not like I'm in tornado country (if that
helps any).

So, what do folks recommend?