50 MHz (6 Meter) Tuner Circuits by AA3SJ
I own an Yaesu FT-817 that I wanted to use on 6 meters but none of my antenna tuners could match my antenna setup for that band.
http://www.qsl.net/aa3sj/Pages/50MHz-Tuner.html

A 40m through 17m Mini End-Fed Halfwave Antenna Coupler by AA5TB
A few years ago I built a little Rock-Mite transceiver for 40m. Since I enjoy using End-Fed Halfwave antennas so much I built a small coupler to use with my Rock-Mite.
http://www.aa5tb.com/coupler2.html

ALT - Altoids L Tuner by KD1JV
Versatile L tuner for end feed wire antennas, fits in an Altoids tin. A compact and light weight system for use in the field by campers and backpackers.
http://kd1jv.qrpradio.com/alt/ALT.HTM

A Mini Tuner for HF by K2JHU
This tiny tuning unit was descibed in the October 1995 edition of 73 magazine and will match from 80 - 10 metres, unbalanced. John has modified it by incorporating a balun and would send details of the unit if required.
http://www.zerobeat.net/g3ycc/minitnr.htm

Antenna Tuning Unit by GØUPL
This Antenna Tuning Unit also incorporates a 50-ohm QRP dummy load, power meter (1 or 10 Watts full scale), and SWR meter! I have used this ATU for a variety of longwire antennas, including outdoor antennas of various lengths ...
http://www.hanssummers.com/atu.html

A Single Coil Z-Match by G3WQW
This ATU was described by G3WQW in Sprat 84 and being balanced can accomodate balanced line, open wire feeder or 300 ohm slotted. 250pF polyvaricon capacitors can be used for up to 15 watts, and a T130-2 toroid.
http://www.zerobeat.net/g3ycc/zmatch.htm

A Tiny Z-match Tuner by JH5ESM
I made some field operations in May and June, 2005. During these field days, MFJ-945E (above, left) consumed large amount of volume in my backpack.
For this reason, I recently built a compact Z-match tuner (above, right) for field usage with my 7T9521 TX and 7R3357 RX.
http://homepage3.nifty.com/jh5esm/homebrew/zmatch.html

Fixed Frequency "Tuner Dipper" by KD1JV
Operation is very simple. Connect the antenna tuner to the jack and power up the Tuner Dipper. Adjust the tuner until the LED goes out. You now have a 50 ohm match. Remove the Tuner dipper from the tuner and connect the rig to the tuner. Your now ready to operate.
http://kd1jv.qrpradio.com/tunnerdipper/tuner_dipper.HTM

Homebrew Antenna Tuner by AA5TB
For years I've thrown together simple antenna tuners to get me on the air when needed. Whenever I would go to a sidewalk sale or hamfest I would pick up any components that might someday come in handy to make a tuner.
http://www.aa5tb.com/tuner.html

Homebrew C-L-C QRP Antenna Tuner by 7N3WVM
This is a C-L-C type tuner with a reflected power indicator. Tuning is done for minimum reflected power. Forward power indicator is omitted because I know the output power of my transceiver anyway.
http://www.qsl.net/7n3wvm/tuner-mini.html

L-Match ATU by VK3VE
A compact L-match ATU for portable use.
http://home.alphalink.com.au/~parkerp/projects/lma.gif

Modified Z Match ATU by G4RGN
This simple aerial tuning unit was described by Doug G4RGN in Sprat 78 and is a useful modification of the Z match. It uses a parallel circuit for 30 - 80 and a series tuned arrangement for the bands up to 10 metres.
http://www.zerobeat.net/g3ycc/g4rgn.htm

QRP 30m through 17m End-Fed Halfwave Antenna Coupler/SWR bridge by AA5TB
One of my favorite single band portable antennas is the end fed halfwave antenna . Such an antenna requires a special coupling network to properly couple my 50 ohm coax to the antenna's high impedance (~5000 ohms).
http://www.aa5tb.com/coupler.html

Short Whip Antenna Tuner by AA3SJ
Here is a circuit that will resonate a short whip antenna for the HF Bands. There is very little information about tuning a short whip on the net that I could find so I thought I'd post it here.
http://www.qsl.net/aa3sj/Pages/Whip.html

Super Tee Antenna Tuner by W3TS
Seven slide switches and seven separate inductors are used to get a wide range of inductance while keeping a high Q. Thus, the tuner losses are very low, an important consideration in QRP operation.
http://www.qsl.net/aa3sj/Pages/SuperTee.html

"The 'Tenna Dipper" A Low Power Antenna Analyzer and ATU Tuning Aid by KD1JV
Using just a few mw of output power, this circuit is used to find the 50 ohm resonance frequency of antennas or can be used to adjust an Antenna Tuning Unit for 50 ohm match, without generating QRM. The unit is powered by a 9 volt battery and a Frequency counter is required to know where the oscillator is tune to.
http://kd1jv.qrpradio.com/tennadipper/tenna_dipper.HTM

The Ultimate Transmatch by W1ICP
Some amateurs assume that because they use coaxial feed lines they don't need a Transmatch. This can be an incorrect assumption, and we'll try to show why in this article.
http://www.arrl.org/tis/info/pdf/7007024.pdf

Z-match for QRP by PAØCMU
The Z-match is a very popular antenna tuner in the world of QRP hams. Surfing the internet pages you can find kits like the NorCal's Balanced Line Tuner and the commercial ZM-2 sold by Emtech™.
http://home.wanadoo.nl/cmulder/zmatch.htm