I have seen this myth in action before, oddly, Not saying it is true, as in I don't believe it.

 If RG58 is such a bad coax on UHF why is it the only NMO Mounts I can find still come with RG58.

 Also if length is not a factor on mobile antennas, why do all mobile antenna mounts appear to come with 17ft of coax. I know the old urban myth of 17ft on the old CB antenna "don't touch that length it will affect its match", Then there is the argument that it does not affect it at all.

I have a class D mono amp at 700 watts rms at 4 ohms u can try haha jk, 3 watts sometimes just is not enough, /I have looked for small 35-50 watt mono amp for PA speaker for my boat. I have even thought of building one.

 if you find one pass the info.

John

  Update, I purchased a Diamond SX-400 and it tested 1.3 across all channels. as high as 467 and as low as 462 at this # should I even attempt to lower it or leave it as is. I am excited to see it show this. 

 This proves that other meter was garbage.

 I got it down to a 1.3/4 on GMRS Repeater frequencies but it clims to 2.5 3 on the simplex frequencies. Hence why you see me question bandwidth on the other thread. I also noticed with my antenna it was very directional and sometimes would pick up better from the side on some frequencies.

 John

Thank you all for your help at helping me understand.

 

well I believe the Elements are 3/8 tube

do more elements close the bandwidth of an antenna, and does 1.5 VSWR mean it will only obtain a 1.5 and no better?

Product Description    450-470 12.25dB Yagi
Product Narrative    12 element yagi has solid elements and threaded mounting holes for positive lock to boom. Available in black finish.
Specific Freq. (MHz)    450-470 MHz
Gain (dB)    12.25
Maximum Input Power (Watts)    300
Bandwidth >1.5 VSWR    15
Vert. Beamwidth (-3dB)    34 Deg.

 I have looked at a few commercial grade antennas and one of there specs is Antenna Bandwidth >1.5 VSWR  15
 
 I am at loss of what this really means, Does this mean +-7.5mhz from your centered tuned frequency?

John

 I thought they called those heaters or foot warmers not lids..

 Not to mention from what I have read, they sound awful on the AM compared to a an actual CB on modulation. Also most will only do 25 watts when they are modified to do AM on those frequencies. A good Cobra or Galaxy would be your best bet. I am looking at the Galaxy 959. I do wish the wattage was increased but it is what it is. Its bad people push more dirty power then they should. Imagine if 100 or 200 was allowed legally. It would make it worse. Most CBers just wanna key down and make noise. I feel bad for the ones who wish to use it for a good reason such as yourself.

 It is a large spring loaded contact, If you think about it in this way your NMO mount antennas use this same idea, Just a lot smaller, Also remember welders are using 30 to 300+ amps at around 28 volts or more.

I have the radio shack one as well, I must admit it does VERY well even when 10ft off the ground

 If they made it that easy, they would have no control over there own radios, Also less money for them to be made.

  My vertex is all pc programmable no VFO