Probably not.
Not necessary but could improve reception. Usual suggestion is 'try it and see'.
Probably not.1. Would I get better reception had a constructed the bowties from copper wire?
Not necessary but could improve reception. Usual suggestion is 'try it and see'.2. Is the reflector necessary?
You'll find that there is virtually no difference in reception between solid and open reflectors. More important issues are distance from the active elements of the antenna and the sizing of the reflector.Are concerns about wind the only reason you recommend screening?