A Compulsory Maintenance !!

Due to two years of no maintenance for my vertical antenna, I am so sorry to announce that I will not be able to be on the air until I can find a solution to fix that antenna or to design a new one.
I am very appreciated for anyone who can help me to design for a vertical antenna that can be erected over a concrete roof, also if there is any solution to decrease the interference that can be generated from the transmission of the signal, it will help me to go up to 100W so many DX stations can hear me around the globe, as it was before.