HAD4008A:
This is a 150.8-162 MHz, 1/4 wave, roof mount antenna intended for customers who do not plan to use the GPS capability of the radio. The signals for these antennas radiate vertically, making them ideal for urban environments where buildings can obstruct the signal.
 

HAD4009A:

This is a 162-174 MHz, 1/4 wave, roof mount antenna intended for customers who do not plan to use the GPS capability of the radio.The signal for this through-hole mount antenna radiate vertically, making them ideal for urban environments where buildings can obstruct the signal.