Gain isn't really a measurement used for shortened HF antennas, it would be a negative number BUT this antenna works well. I always get good reports - the important thing is tuning the antenna.

Shark Antennas S-F20 Mono Band HF 20 Meter Mobile Vertical Antenna with 3/8x24 Threads, Handles 250W Max

Shark Antennas S-F20 Mono Band HF 20 Meter Mobile Vertical Antenna with 3/8x24 Threads, Handles 250W Max

Q: What frequencies does this work with? I’m specifically looking at 915MHz

This is the wrong antenna for that frequency. This works in the 14 Mhz band. It is way too low I don't think Shark makes on for the 915 Mhz band, I think the highest frequency they make one for is 6 Meters (50 Mhz)

Q: I see a couple of people mention tripod mounting - what do you do in the way of counter poise & grounding?

First let me say these Shark antennas are great. I primarily use mine with the mag mount quick disconnect. When you use a tripod on the ground you must have at least one radial a quarter wave long for the freq. in use. I use four radicals but it will tune with one. Without radicals it will not tune. Spell check sucks. Thx

Q: I have trouble tuning my Shark. Can someone suggest approximate overall length that should tune for the high end of 20m?

I had some trouble also, it took some time with my antenna analyzer before I finally got it to a reasonable tuning. My final SWR was about 2, which was higher than I liked. The adjustable end is 30 3/8 inches from the ferule to the tip. That was with about 50 feet of coax on the line. Incidentally, i was able to hit Europe with that antenna. I have to Shark hamsticks with the MFJ fitting to make them into a dipole. -Paul- Also, don't buy the 80 meter hamstick. It has a very narrow window of tuning.

4.5/5

Product ID: 205330663

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⚡250W max power

📡44" fiberglass mast

🔧3/8x24 thread base

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📡 Elevate Your Communication Game!

COMPACT PORTABLE - At just 44 inches, this antenna is designed for easy storage and transport.
UNLEASH YOUR SIGNAL - Experience the power of a 250W max antenna, perfect for serious ham radio enthusiasts.
EXPAND YOUR BANDWIDTH - Pair with multiple sets for a horizontally-opposed dipole and cover your favorite bands effortlessly.
VERSATILE MOUNTING OPTIONS - Easily compatible with various mounts, allowing for customized setups.
ADJUSTABLE WHIP FOR PRECISION - Features a removable 48" stainless steel whip for optimal tuning.

The Shark Antennas S-F20 Mono Band HF 20 Meter Mobile Vertical Antenna is a high-performance solution for ham radio operators, featuring a robust 44" fiberglass mast, a powerful 250W max rating, and a versatile 3/8x24 thread base for easy mounting. Its adjustable stainless steel whip and compact design make it ideal for both stationary and mobile use.

Have a Question? See What Others Asked

What frequencies does this work with? I’m specifically looking at 915MHz

What is the gain?

I see a couple of people mention tripod mounting - what do you do in the way of counter poise & grounding?

I have trouble tuning my Shark. Can someone suggest approximate overall length that should tune for the high end of 20m?

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Shark Antennas S-F20 Mono Band HF 20 Meter Mobile Vertical Antenna with 3/8x24 Threads, Handles 250W Max

Product is unavailable

Description

Have a Question? See What Others Asked

Common Questions