I had occasion to test four popular amateur radio mobile antennas. Here are the results of SWR and Return Loss of a Diamond SG7900ANMO, Larsen NMO 2/70, Cushcraft CS-270M and Laird QW144.
Return Loss and SWR measurements of a permanent 2m whip installation mid-roof of a Ford Taurus. The effect of doors is shown.
Lab tests show post WW2 connector designs perform exceptionally well up to 500 MHz. The SMA, BNC, TNC and N connectors are great.
We pit the PL-259 (and SO-239) against more recent connectors. This is the list of contenders plus a description of the test setup.
The MFJ Analyzer products make easy work of tuning a coaxial quarter wave stub.