Hi there,
The whip antenna that oceans777 is showing is exactly what i am running on top of the BS 1100 and find it gives very good results indeed but i am fortunate in that in am 470ft A.S.L.with the antenna on the side of the house on a 10ft pole above the apex of the roof,i will not tell you how far my poplar diagram goes, because i have an unfair advantage with my location.but YES the BS1100 works superb with the whip that is shown,not he one that comes with the BS1100,the cost of the whip is £25.hope this helps.
Regards Terry.