Wideband matching for power amplifier

hi friends
i have some problem in using ferrite cores in "transmission line transformer".
my bandwidth is 100~350MHz. I wanna use this matching network in power amplifier with 300watt output power. can anyone help me in the way of selecting the core? or if anyone have better suggestion than using TLT in this bandwidth?

This might be a good start to read and actually the bandwidth should be adequate for your design:
http://www.polyfet.com/HFE0503_Leong.pdf
There are more intersting articles and designs on Polyfet′s website.

Greets
Jens