[Antennas] measuring SWR

[Mike Miller]

I'm trying to match my  2m copper pipe j-pole to the feed line. 
When I had it on the  ground I could adjust the feed  point and 
get a very low swr across the band. After I put it up I couldn't 
get a good match at the lower frequencies but could at the high 
end of the band. This was measured at the transmitter end of the 
feedline. Now I've changed the  feedline length and the apparent 
swr has changed again. 

How can I  eliminate the  transmission line transformer effect 
while trying to adjust the feed point taps to a 50 Ohm match? 
Will using a 1/2 wave length line between the swr meter and 
antenna show me the true swr?

TIA

Mike  KC9DOA