The gain remains roughly constant over a wide range so the element length does not require adjustment. Compared with dipole antennas, these antennas have a gain of 5 dB.

Model MP635A MP666A
Frequency range 80 to 1000 MHz 200 to 2000 MHz
Input impedance 50 Ohms (connector: N-type)
VSWR <=2.5
Average relative again 5 dB
Maximum input power 10 W
Front-to-back ratio >=15 dB
Dimensions and mass 200 x 200 x 1750 mm, <=7 kg Ø140 x 900 mm, <=5 kg