Mobile HF Antenna Installation
This is what I’ve been working on the last two weeks. Have you seen the Hi-Q 5/80 mobile HF antenna? All I can say is, WOW! It’s a 5 inch coil mounted on a two foot mast. I picked up this Hi-Q 5/80 from a Ham friend (Gene, W9NMX – Silent Key now) who lives in Florida. It’s a 10 – 80 Meter mobile HF antenna. Gene has been a big help guiding me as I install it.
This one has a 12″ extension above the coil, a capacitance hat, and a 3 foot whip. Gene, W9NMX, sent it with a capacitance hat, custom mount and MFJ 907 in a waterproof case.
With the MFJ 907 there’s no need for a shunt coil.
Why On the Front?
I installed the Hi-Q 5/80 on the winch mount of my 2006 Hummer H3. The old Tarheel 200A I had mounted on the rear bumper did a great job, but when towing my camper I couldn’t use it.
With the Hi-Q 5/80 mounted up front there should be less shadowing effect from the camper, so I’m hoping this works good. I’ll know in the spring.
Hi-Q 5/80 Mobile HF Antenna
Lower Mast: 1.5″ diameter and 2′ long. This one is stainless steel. They also come in a black anodized version.
Coil Size: 5″ diameter x 11.5″ long, lexan polycarbonate housing. This one is semitransparent and I can see plunger inside.
Weight: 8 lbs.
Total height: With 3′ whip, 11′ 4″.
EB8 Capacitance Hat: All aluminum hubs and extension rod, with stainless steel rods as radials. All hardware is stainless steel.
Hi-Q 5/80 Antenna Mount: Custom mount (Gene, W9NMX) that fit perfectly on the winch mount plate. It includes attached ferrite cores wound with the control cable. There is also a brace about 18″ up to hold the mast securely.
Controller: I’m using an old Tarheel controller (no model number) that does not have memories, but it does have a counter.
Grounding and Bonding: I ground the paint off the winch mount where the Hi-Q mount is bolted on and the bottom of the Hi-Q mount base. I had to use a little copper braid between the Hi-Q mount base and the winch mount . There is also copper braid attached from the Hi-Q mount to the brush guard.
The winch mount and brush guard is bolted directly into the frame of the Hummer. I did some grinding to make a good connection. For bonding, see my vehicle bonding article.
Currently I’m using a 3′ stainless steel whip. There is a whip quick disconnect between the coil and 12″ mast. This allows a quick way to remove the upper part before entering a car wash or drive through.
I hope to hear you on the air!
73’s – Rich, K0PIR
UPDATE: 4/14/2018 – I tried ordering a 2′ mast extension that is shown on the Hi-Q website, but they don’t make it anymore. Now I’m looking into the Breedlove mounts. Without the 2′ mast extension I need to move it higher up on the vehicle. I’m mounting it on my roof rack.