Ya - I didn't catch that one.
Longer wavelengths requires a larger antenna, hence you aren't going to use a 2 meter antenna to listen to 80 or 160 meters - at least you probably aren't going to work much DX - but the bottom line is - you need more then one antenna to do everything...

MIght I suggest the Barker and Williamson BWD 90 folded dipole for the HF bands. Problem is - it costs more then 200 dollars.

The Diamond X510 should not give you much problems with bending - opposed to what Wabnig sez...

Technicially, you should never put a vertical antenna at the very top of any tower. You should side mount it - which would eliminate any bending or flexing. Putting it at the top of the tower - just turns it into a good lightning rod.