[Hammarlund] BEST ANTENNA??

[Pat & Rich McKinney]

DE WB4VFN Rich and I have been working on several boat anchors for friends.  I have on my bench now a sp400 and a 129x.  Looking for input on best antenna setup.  The book shows it wants a balanced input at 300 ohms.  For my station I use a ladder line fed doublet and that seems to be what these old rigs like best.  But most people like to use coax these days.  The 129x even has a pl259 for the antenna input.  In playing around I found that the rigs...especially the sp400 don't like one side of the antenna coil grounded.  Seems like the signal comes up a little but the noise comes up a big lot.  I tried using a tv balun coax to twin lead to match it but insertion loss was too much.  Just wondering if anyone else has found best way to match in antenna input to coax.  
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