I'd like to suggest that one very good reason for using centre-fed and external 
matching unit is because the harmonic pickup from nearby stations is much 
reduced compared to multi-band antennas.  This is best implemented when the 
antenna is as near perfectly balanced as possible to avoid feedline pickup.  A 
*proper* choke to cancel out-of-balance currents should be helpful in this 
regard. 

For single station field days, I've used the Spiderbeam 807 off-centre-fed 
inverted V dipole on a f/g pole which is a fast way to get on air without an 
external matching unit to fiddle with. Common mode current is virtually zero. 
It's a great solution for beginners reducing the fiddle factor, ie plug and 
play KISS.  Less to carry out into the field as well. 

David G3UNA/G6CP
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