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February 21st 04, 05:59 PM
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On Sat, 21 Feb 2004 08:08:23 -0800, Bill Turner
wrote: On 21 Feb 2004 00:07:50 GMT, ojunk (Greg Doughty) wrote: My only option is an adjustable angle mount on the hood, rear gate, or mounting the antenna to the frame under the front or rear bumper? _________________________________________________ ________ Why not a mag mount on the roof? It will work better than any of the above. You won't have to drill any holes if you route the coax through the door jamb. I've done that on many vehicles with no problems at all. You'd think the coax would get squashed when the door closes, but it doesn't; at least not enough to matter. Actually, many of the complaints made to this board often reveal that both the "thru-the-glass" and magmount are inferior to sheet metal mounted antennas. Both style certainly work, and well enough for most, but for those at the edges, they find much better performance from good solid metallic connections. On 2 meters, when you put an antenna down low, like on the bumper, two things happen, both bad: It becomes very directional due to the blocking effect of the car body, and it's ground wave coverage drops dramatically. Higher is better. Higher is always better, but I would dispute that the car body somehow "shields" an antenna (unless the antenna is butt up against the cab, say). More often than not, the favored direction (the major lobe) is found aligned in the direction of the most metal. That is, with a bumper mount or fender mount, the best propagation is corner to corner across the car NOT away from the car. In other words, the sheet metal of the body supports and favors lobe development (instead of the metal acting as reflector). I've noted this documented by QST since the '60s. 73's Richard Clark, KB7QHC |
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