[K3CAL] dual band mobile antenna question

[KB3WFV]

Hello 
I am considering purchasing a new 
dual band 2m/440 mobile radio with crossband repeat
and I am wondering about the antenna (s).
 
Which would be better?
 
A single dual band antenna
 
or two antennas one 2 meter and one 440 
with a duplexer
 
Brian
KB3WFV  
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