The 301133 is a dual band/Iden mirror mount trucker antenna with a height of 21.5 inches. It is attached to the mirror with either the 901106 or the 901014. This antenna is similar to the 301101. The difference between them is that the 301133 comes with a spring attached to the bottom of the antenna thereby allowing it to bend if it hits a tree. The 301101 does not come with a spring. The spring (991107) is available for sale.

 The disadvantage of the spring on the 301103 is that if the spring breaks, the antenna is irreplaceable. If the spring brakes on the 301101, it can be replaced with another spring.