First of all, I want to apologize about my late response. I would like
to try answering your questions:
1. All the above you' ve mentioned are true.
2. Actually is 60 degrees.
3. Electrical 0.5 WL.
4. This will be a university postgraduate theses.
5. The antenna is intended to be used at 1111MHz. However I dont' know
how high the driven element will be above the earth's surface.

With regards
Dimitris