In assembling in the mounting bracket, you have 3 washers. 1 flat, 1 locking and 1 plastic isolator. as far as the isolator, top or bottom?

Antenna on top, then the plastic washer, then the metal mounting bracket, then the flat washer, then the locking washer. The antenna has to be isolated from the mounting bracket so make sure it is centered on the plastic washer or it will short out your system and the base of the antenna mount has to be grounded. You should check your SWR ratio before talking on your radio and if it is above 1.5 learn how to adjust it. If you know how to adjust it and still can not get a good reading try adding a ground wire from the antenna base to a metal ground. Certain trucks like the Mack Granite have isolated mirrors and require the ground wire.

How would you mount these antennas behind the cab of a f 550 flat bed?

You would need the L-bracket to mount to the back of the cab. If you bed has the security frame at the cab you can mount to that with a bracket.

how many come in the package?

One and it sucks it fell apart using a 4 foot fire stick antenna

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📡 Mount your signal, own the road!

BUILT TO ENDURE - Heavy-duty SO-239 stud designed to withstand demanding environments and heavy use.
BULK PACKAGING FOR PROS - Ideal for fleet managers or installers needing multiple mounts without retail packaging waste.
STREAMLINED INSTALLATION - Simplifies your antenna setup process, saving time and boosting operational efficiency.
COMPLETE FIRE STIK COMPATIBILITY - Works flawlessly with all FireStik antennas and mounts—no guesswork needed.
UNIVERSAL FIT FOR EFFORTLESS SETUP - Seamlessly mounts through any standard 1/2" hole for instant compatibility.

The FireStik K-4A is a heavy-duty SO-239 stud mount designed for CB radio antennas, fitting any 1/2" hole and compatible with all FireStik antennas and mounts. Sold in bulk without retail packaging, it’s perfect for professional installers and fleet operators seeking durable, reliable antenna mounting solutions.

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Item Package Dimensions L x W x H	2.32 x 1.42 x 0.87 inches
Package Weight	0.06 Kilograms
Item Dimensions LxWxH	6 x 6 x 6 inches
Item Weight	9.07 g
Brand Name	FireStik
Color	Silver
Number of Items	1
Manufacturer	Firestik
Part Number	4332975828

FIRESTIK K-4A CB RADIO ANTENNA HEAVY DUTY SO-239 STUD MOUNT (BULK)

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