good morning Martin, Why not use a db-201 folded loop ground plane instead? It is half the length of the db-212 which needs at least 2 bays to be halfway decent. (they make em with 3 and 4 bays also. the pattern off of the 4 bay is the best for coverage. The 3 bay has too much 3 leaf clover effect).
Anyhow, I have 4 of the db-201s' right now that i'm shortening for 6m. It is only about 51-52 inches total height(1/2 wave folded loop). these antennas' have no gain , but are DC grounded and will side mount Ok. Put it about 4 ft. out from the tower. It seems to me that if you are restricted on antenna space and height then it can't be a good location or have very good coverage to begin with. just my opinion!!! These antennas areplentiful. just look for old busunesses or Police , fire and city gov. locatons that used to use low-band many years ago.a j-pole for repeater use is ok too, just real long!!!
