<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hi-ho…</div><div class=""><br class=""></div><div class="">Define high gain? You’re not going to do much better than 3dB gain on a mobile VHF antenna unless it’s a really long stacked dipole / collinear arrangement which is going to cause more problems than it’s worth.</div><div class=""><br class=""></div><div class="">(You can buy mobile antennas that claim more gain on eBay etc, but if they’re not really long, they’re using more sales speak than technology, you can’t beat physics!)</div><div class=""><br class=""></div><div class="">A 5/8 whip for general VHF use is about 1m long, and gives ~3.5 dB gain, with a tail wind. On most cars anything longer is going to give you all sorts or problems with trees, garage doors, carparks.. This assuming you put it on the roof?</div><div class=""><br class=""></div><div class="">With a mag-mount it can’t go on the boot/bonnet unless you take it off every time you open the boot/bonnet in which case you’re going to leave more marks on the car than the two or three small holes required to put a lip-mounted L bracket on there which you didn’t want to do in the first place. :-)</div><div class=""><br class=""></div><div class="">Anyway… Jaycar sell a decent SO239 magmount with a PRS designed whip on them and you could put any whip you like on there.</div><div class=""><br class=""></div><div class=""><a href="http://jaycar.co.nz/productView.asp?ID=DC1064" class="">http://jaycar.co.nz/productView.asp?ID=DC1064</a></div><div class=""><br class=""></div><div class="">For receive only VHF the PRS whip might be fine though though from memory it had a trap or some sort in the middle, I chucked mine out, just wanted the mag mount and couldn’t be bothered mail ordering one in.</div><div class=""><br class=""></div><div class="">I’ve got one of these and use it on the 4x4 to take a dual-band whip and it’s pretty solid, hangs onto the roof at highway speed and puts up with the 1.2m antenna being ‘twanged’ on trees etc.</div><div class=""><br class=""></div><div class="">Although it will damage the paint underneath if you have it on full time, or you trap a teeny little bit of grit under it and look at it the wrong way.</div><div class=""><br class=""></div><div class="">I had it on the hatchback that I commute in for about six months with a 1/4wave for APRS and it left a fine rusty ring on the roof where grit/water got under the edge even though it as a plastic face. I had to sand/prime it and pick up a matched spray-boom.</div><div class=""><br class=""></div><div class="">If I put APRS back in that car I’ll drill a few holes and put a proper 5/8 stud antenna mount in the middle rear of the roof or something I think. I have a stainless SO259 ‘L’ bracket on the passenger side front which has the antenna for the mobile rig I also use to listen to other random stuff, mostly ATC when I’m driving near the airport.</div><div class=""><br class=""></div><div class="">YMMV, just my 2c worth etc.</div><div class=""><br class=""></div><div class="">Cheers, Chris H.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div><blockquote type="cite" class=""><div class="">On 14/12/2014, at 10:29 pm, Stephen <<a href="mailto:kiwis1@slingshot.co.nz" class="">kiwis1@slingshot.co.nz</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">Can anyone please help with a high gain receiving only vhf mag antenna? If I have to get it from Oz or US so be it.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class=""> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">I’m not allowed to put any holes in our new car!, and my existing mag ants are deaf on vhf.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class=""> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class="">Thanks<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="font-size: 12pt;" class=""> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Stephen<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div></div><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">_______________________________________________</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">TheList mailing list</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="mailto:TheList@radiowiki.org.nz" style="color: purple; text-decoration: underline; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">TheList@radiowiki.org.nz</a><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><a href="http://radiowiki.org.nz/mailman/listinfo/thelist_radiowiki.org.nz" style="color: purple; text-decoration: underline; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">http://radiowiki.org.nz/mailman/listinfo/thelist_radiowiki.org.nz</a></div></blockquote></div><br class=""></body></html>