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DB

From the assembly instructions I slotted the tubes in for a frequency of 27.15-27.2mhz,

The measurements I gave are total assemble radiator lengths,
subtract 1" from the lower radiator for distance between feed point tap & lower phasing coil tap,
subtract 1/2" from the upper radiator,

The coil is 9" between the pegs,
9 turns x 116mm or 4.57" between the centers of the coil wire,
wire diameter is 6mm or .236"

If you need anything else let me know,

If 18.1ft is the freespace 1/2 wave @27.15mhz your spacing/gain chart is inline with what w8ji claims.

<blockquote data-quote="bob85" data-source="post: 855269" data-attributes="member: 18">DB <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt="(y)" title="Thumbs Up&nbsp; &nbsp; (y)"&nbsp; data-smilie="27"data-shortname="(y)" />From the assembly instructions I slotted the tubes in for a frequency of 27.15-27.2mhz,The measurements I gave are total assemble radiator lengths, subtract 1&quot; from the lower radiator for distance between feed point tap &amp; lower phasing coil tap,subtract 1/2&quot; from the upper radiator,The coil is 9&quot; between the pegs,9 turns x 116mm or 4.57&quot; between the centers of the coil wire, wire diameter is 6mm or .236&quot;If you need anything else let me know,If 18.1ft is the freespace 1/2 wave @27.15mhz your spacing/gain chart is inline with what w8ji claims.</blockquote>

[QUOTE="bob85, post: 855269, member: 18"] DB (y) From the assembly instructions I slotted the tubes in for a frequency of 27.15-27.2mhz, The measurements I gave are total assemble radiator lengths, subtract 1" from the lower radiator for distance between feed point tap & lower phasing coil tap, subtract 1/2" from the upper radiator, The coil is 9" between the pegs, 9 turns x 116mm or 4.57" between the centers of the coil wire, wire diameter is 6mm or .236" If you need anything else let me know, If 18.1ft is the freespace 1/2 wave @27.15mhz your spacing/gain chart is inline with what w8ji claims. [/QUOTE]

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