40 metre

W1AB Killer Antenna - An elevated ground plane sized as a 40 meter antenna but fed with ladder line and antenna tuner for hf and 160 meters.

Slink-ette antenna - A Slinky-based doublet or loaded vertical QRP antenna tested for 40 meters band by N2CX and N2EI

40 Meter TAK- tenna home made - Bill's HomeBrewed 40 Meter TAK-tenna or TAK Antenna

40M Twin Half-Square Array - 40 meters elevated vertical antenna array at VA7ST

Delta loop antenna for 40 Meters - A full wave delta loop antenna for 7MHz

7el 50MHz 9.7mtr LFA Yagi Priority listing - A 7element 9.7 metre long 6M LFA Yagi. flat SWR with no match required. Supper pattern, Gain and F/B

6 elements LFA antenna for 6 meters - A high-gain 6 element LFA Yagi with a 7.3 metre boom for 50MHz

40/80 Trap Dipole Design - An home made trapped dipole antenna for 40 and 60 meters band by 2E0HTS

End Fed Half Wave Antenna Coupler - A 40m through 17m Mini End Fed Half Wave Antenna Coupler by Steve Yates - AA5TB

RX antenna for 160/80 meters - RX Antenna 160m/80m Band Splitter/Switch, a small project that will work along with the K9AY RX antenna

7MHz - 14MHz Slot Fed Skeketon Antenna - 40 to 20 meter band slot fed skeleton HF Antenna.

Outdoor 40 Meter Stealth Dipole - Just a basic dipole, under the edge of roof.

Tower Project at KD5OM - U.S. Tower MA-40 installation at KD5OM

Multiband HF Vertical - A telescopic pole that you adjust to suit the band you're working on , tested on 40 20 and 15 meters band by M0PZT

G8ODE W3DZZ Antenna - W3DZZ multiband antenna for 80-40-20-15 and 10 meters band

12el 50MHz Low Noise LFA Yagi - A 22 metre long 50 Ohm Monster 6M 12 element Yagi. Super gain, Flat SWR, excellent F/B 50 mhz antenna.

QSY Society Amateur Radio Club - The club is promoting awareness of Henry Hudson's 400th anniversary voyage of discovery, as well as encouraging others to try amateur radio and foster goodwill.

WebSDR in USA K7UEB - WebSDR at K7UEB,40 and 20 meters receiver in Walla Walla University USA

QROlle, 6 Band QRP-rig - QROlle QRP-rig. 6 Band Shortwave rig with SMD:s. 160, 80, 40, 30, 20, 17 meters SSB/CW QRP-rig. All documentation in English

GAP Titan Product Reviews - Covers 10m 12m 15m 17m 20m 30m 40m and 100 KHz on 80m, & WARC Eham Reviews

GAP Titan DX - Test Details - GAP Titan DX 10 15 20 40 meter performance tests by AA3RL

Yaesu VX-8R/E - Specifiation at rigreference.com about Yaesu VX-8R/E

Low Pass Audio Filter - 440 Hertz peaked low pass audio filter experiments

A 40 meter SSB QRP transceiver - This transceiver was conceived as a power-efficient, small, lighweight unit to be carried in the backpack, along with antenna and battery.

DSB/CW QRP rig for 20 and 40 mt. - An experimental DSB/CW QRP rig for 20 and 40 meter bands