Toroid Fair-Rite 2643251002 mix 43 per End Fed Half Wave EFHW con condensatore TDK
Capable of supporting on peak up to 400w SSB, 250CW and 100w Data. You might want to output more power and I don't find it problematic as long as you use 16awg wire or thicker. You need to use high quality TDK 100pf capacitor.