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SO-239, PL-259 provide a loss of approximately .5dB per connection at 145Mhz and a poor 50 ohm connection. Time Domain Reflectometer measurements indicate over 2:1 VSWR (Impedance Bump!) at the connection.
Whereas N connector's have appr'x .042dB Insertion Loss and an excellent 50 ohm connection.
Basically use SO-239, PL-259 below 30Mhz. I still wish manufacturers would use N connectors on all gear. I find them mechanically and electrically better all around.