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

Product ID: 47834198

Details

Antenna
Radio
Brand
FireStik
Color
Silver
Impedance
50 ohm
Manufacturer
Firestik
Number of Channels
40

📡50Ω impedance for optimal signal

🔩Fits any 1/2" hole, universal mount

⚙️Heavy-duty SO-239 stud mount

R675

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Description

📡 Mount your signal, own the airwaves!

PRECISION FIT - Designed for any 1/2" hole, guaranteeing a secure and stable installation every time.
BULK VALUE PACK - No retail packaging means you get more for less—perfect for professionals and enthusiasts stocking up.
ROBUST CONSTRUCTION - Engineered with heavy-duty materials to withstand demanding environments and ensure longevity.
UNIVERSAL COMPATIBILITY - Seamlessly fits all FireStik antennas and mounts for effortless upgrades.
PRO GRADE SIGNAL INTEGRITY - 50-ohm impedance optimizes your CB radio’s performance for crystal-clear communication.

The FIRESTIK K-4A is a heavy-duty SO-239 stud mount designed for CB radio antennas, featuring a universal fit for any 1/2" hole and compatibility with all FireStik antennas. With a 50-ohm impedance, it ensures optimal signal transmission, making it a top choice for professionals seeking durable, reliable antenna mounting solutions in bulk.

Specifications

ASIN	B0765QHQMZ
AntennaDescription	Radio
Best Sellers Rank	#255 in Two-Way Radio Accessories
Brand	FireStik
Color	Silver
Customer Reviews	4.7 4.7 out of 5 stars (3,692)
Impedance	50 ohm
Item Dimensions L x W x H	6"L x 6"W x 6"H
Item Weight	9.07 g
Manufacturer	Firestik
Mfr Part Number	4332975828
Model Number	13
Number of Channels	40
Number of Items	1
Number of Packs	1
UPC	714833139720 757183692668

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R675

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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