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Please visit: http://nx4d10.wix.com/waller-flag

                                    Central Florida - Swamplands QSL

                                                     VWF Antenna











                                        Small 160m Loop Antenna                         

                              Waller Flag Antenna in the swamp 


Original Waller Flag Receive Antenna

From 2002 to 2009, the first WF confirmed 245 (presently 304) countries on 160 meters from a small, noisy sudivision  lot.   With two Loops of 7' X 14', the total width is 30 feet. It exhibits excellent low-noise reception on 160 - 30m with no switching required. Utilizing Insulated loop wire, it performs with no noise due to rain, sleet or wind, and no static  leakage noise due to area thunderstorms charging the antenna. It was raining the morning of a 160m QSO with  JT1CO.  The last needed CQ Zones on 80 and 160 meters were easily worked with the WF from this 0.18 acre lot. 

The WF is the only reasonably sized, high-performance rotary beam antenna for 80-160m. The WF makes possible the  160m high-performance, multi-directional reception of **Eight - 800 foot Beverages**  from a small subdivision lot,    the United Nations Building roof top,  or from a Scarborough Reef Plywood DX platform.                                                                                                                                                                                                                                                                                                                                                    

                                                      Low Band Receive Antenna 

                         Low Band Waller Flag Antenna on a 1/5th Acre Subdivision Lot


The present Waller Flag shown below is 50 feet wide with 26' tall loops and is optimized for 160m "weak sig in the noise" DX'ing. Gain for 160m is -38.95 dBi, +1.0 dBi gain with preamp, and the RDF = 12.2 dB. (by comparison a Flag Loop = 7.4 dB RDF; A 4^2 of K9AY Loops = 9.1 dB RDF; and a 910' Beverage = 11.9 dB RDF - see K7TJR Antenna Comparison Chart online). 

    "High RDF at the optimum elevation angle delivers Stunning Weak Signal Reception"

Unlike ground dependent antennas, the WF can be placed at any height, where there is less ground noise and signal attenuation.Weak DX signals can be stronger up higher, due to less ground and clutter attenuation, and possibly by eliminating one lossy propo hop. Unlike fixed position, direction-switchable antennas the WF does not have low-gain gaps in it's pattern. Being able to rotate the WF as little as 10 degrees can cause a weak DX signal to "pop out" of the noise. There is minimal coupling to adjacent wiring & power lines. A receive 4-square antenna was not directional at this QTH on 160m due to coupling with local wiring. The challenge is no longer how to hear, but how to be heard from a 0.18 acre lot using an 82 foot 160m vertical with only one-half of a small radial field.

This WF has been in service since Oct. 2, 2009, withstanding nearby lightning strikes & high winds with no maintenance required due to it's simplicity. The WF employs only two small loop xfmrs and two 3-watt resistors outdoors with an ultra low noise, high gain preamp deployed in the shack. No vulnerable outdoor phase switching networks or preamps exposed to lightning damage are required. This WF has heard 300+ countries on 160 meters with performance similar to an 800 foot "Rotary Beverage." The Waller Flag does not clutter the ground with wires, stakes, cables and ground rods, uses available space over the roof, and may well be the ultimate multiple-lowband receive antenna for small spaces.

                                               800 foot Rotary Beverage Antenna Performance

                             Best 160m Receive Antenna for small lot 


                                                    160 Meter Loop Antenna 


Waller Flag Antenna vs. Single loop Rotary Flag  Most small lot receive antennas suffer some degree of noise re-broadcast (reflections ) from surrounding wiring. Using the PolarPlot program with a rotary WF antenna makes it easy to identify and possibly alleviate any reflection problems. Unlike fixed position receive antennas, a WF is easily rotated to confirm performance. The xmit tower is 60 feet away from these antennas at this QTH. When tower neutralization is turned off, the below patterns are distorted. Often directional patterns are spoiled by inadequate RF choking or lack of common mode breaker xfmrs. There are many such spoiled antenna plots online.

The Rotary Flag antenna referred to below is the single loop design made popular by K6SE & W7IUV. This Rotary Flag antenna was deployed at NX4D for a few months prior to being converted to a two - loop WF, reusing the same simple fiberglass frame. Noise mitigation due to the reduced Azimuth and Elevation Beam Widths (BW ) and the corresponding RDF increase of the WF is remarkable, allowing weak 160M signal copy at a small lot QTH. The WF is not a so-called "compromise antenna", often outperforming local Top Bander's 800 foot Beverage antennas on 160.

                                         Waller Flag Antenna vs. single loop Flag Antenna


















                                  160 Meter Antenna Design


Typical small lot QTH.  It would seem impossible to work 299 160m countries and 40 CQ Zones from this wire jungle in a few years, but the impossible is now possible. I expect to work 320+ Top Band countries from this 1/5th acre lot as they become available, thanks to this incredible Small Lot 160 Meter Receive Antenna.

                       Small 160M Receive Antenna

                                       160M Receive Antenna for Subdivision Lot

       Small Garden 160 Meter Receive Antenna surrounded by aerial power and CATV lines.


Waller Flag Antenna vs. Single Loop Flag Antenna    Eznec Azimuth & Elevation plot comparisons below illustrate the noise reduction for the dual phased endfire loops WF Antenna vs. a single loop Flag antenna.

                                                                     160 Meter Loop vs. WF Loops

Superior response of the Waller Flag Antenna. The single loop Flag Antenna suffers reception from "straight up", the source of excessive noise.  Most 160 M Loop Antennas exhibit this high pattern.

                                 Best 160M Loop Antenna Pattern










                                                    160m antenna for small garden

Some LoTW confirmations using the Waller Flag Antenna  Top Band DX'ing from a small lot is exciting when you can hear the weak DX. My goal of working 300+ DXCC entities and 40 - 160M WAZ zones is now in sight. Some DX entities I have confirmed, but not on LoTW are: BU2AQ, 9M2AX, HL5IVL, 4S7NE, DU7ET, 4J5A, V63UA, DU9/N0NM, and EX8M. I have missed YB0ARA/9, 9M4SLL, HS0ZEE, H44MY, VR2XAN and other new ones due to their not being able to hear me calling. During the winters I have often been able to work SE Asians at many times when no others were calling.


  Low Band Receive Antenna - 80m Receive Antenna - Low Band Receive Loops Antenna


                             160M Antenna for small lots

    Waller Flag Antenna subdivision performance compares to typical large acreage 160m antennas. 

                                   Small 160 Meter Receive Antenna                       

                                                        NX4D Antenna


8443478 Last modified: 2017-11-10 03:17:10, 17750 bytes

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