<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">On 2013-02-21, at 9:52 AM, Mike Perkins <<a href="mailto:mikep@randomtraveller.org.uk">mikep@randomtraveller.org.uk</a>> wrote:</span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><blockquote type="cite"><font color="#000000"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">The design of an antenna involves much experimentation and witchcraft and results in a device that has what are usually referred to as /side-lobes/.</span></font></blockquote><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">To take some of the witchcraft out of selecting the guy at <a href="http://hdtvprimer.com/">hdtvprimer.com</a> has put up models of what kind of gain you can expect at various angles. For example this common choice:</span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> <a href="http://www.hdtvprimer.com/ANTENNAS/cm4228.html">http://www.hdtvprimer.com/ANTENNAS/cm4228.html</a></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Take a look here for a comparison with links to specific models:</span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> <a href="http://www.hdtvprimer.com/ANTENNAS/comparing.html">http://www.hdtvprimer.com/ANTENNAS/comparing.html</a></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">- George</span></div></div></body></html>