Hello friend,
I think your project is very interesting, I'm sure I am qualified to accomplish the design of this kind of antenna. I have experience designing and building microwave antennas as I'm a lecturer and researcher in this field. You can check my portfolio.
It would be great for me to work in your project because I like this field. Nevertheless, the budget you propose is very low, the minimum I would charge for this kind of project is $115 because it covers the calculation and simulation of the UWB antenna. I'm making the offer under the budget but if you accept it you have to know that I will charge minimum $115. I hope you understand it.
I look forward to work with you.
Best regards,
MSc. Andry Contreras