You get extra long range on 440 MHz with a high gain halfwave over quarter wave antenna and solid 1/4 wave performance on 2 Meters
Capable of supporting 2" boom antennas such as the TH11DX
complex impedance
If the serial number on your ALS-500M is below 13049
Pofung/Wouxun HTs with reverse SMA
MFJ-1979, EXTRA-LONG SS, TEL ANT, 17 FT, 3/8-24, SS(758-1193-7) Antenna Pigtail You get extra long rangeMFJs premium stainless steel telescopic whips are the perfect choice for building collapsible multi band dipoles, mobiles, portable and base antennas. They are great for traveling, mini DXpeditions, vacations, etc. They can also be used to replace your current automatic screwdriver whip for a more highly efficient fixed mobile operation. Rigidly collared at the base, stronger than plated brass, and impervious to rust and corrosion, they stand up to