you could look into a no ground plane base type antenna made by tram. it is about 1 inch in diameter and 39 inches long. a buddy of mine has one on his fiberglass mobile home and it talks just fine. swr about 1.5 and he made a mount while mobile he can lower it by tilting it over with the mount he made.
there is a lot of options out there just take a look. 102 inch whip would work just fine also.this will mget you out about 5 to 10 miles depending on condditions and 600 or more with skip rolling good. so just take your choise.