Matt,

Nothing wrong with an external tuner.   It will probably have a better 
matching range than the internal tuner, but isn't magic.   Maybe contact 
the antenna builder  and get his advice.   Perhaps some tweaking of the 
antenna or feedline can save you the cost of a tuner.

  Do the other bands tune to your liking?   Are you trying to go from 
3.5 to 4.0 mhz?   It may be a lot to ask of a 73 foot antenna, no matter 
what tuner is used.

Good luck, Steve KW3A

On 5/3/2015 12:28 PM, Matthew Chao wrote:
> Hi, Folks.  I have a TS480SAT which has a built-in auto tuner.  Had
> one of my ham buddies come over and test the setup he and his buddies
> put up, an UltraLight Junior dipole strung between two trees and my
> house.  We noticed that on 3.550MHZ, we were getting 4-1 SWr, egen
> though the antenna can go down that far - 80-10 meters.  Above
> 3.8MHZ, the antenna tunes up.
>
> My question is:  if I buy an external auto tuner, will I have more
> flexibility in getting a match.  Are the the built-in tuners mor
> limited than the external ones?  And what accessible tuner would you
> recommend if there is a difference?Thanks in advance.--Matt, N1IBB.
>
>
>