6 meter
Six Meter Monster Beam   8el, 41ft boom, 14.0 dBi gain, N6CA        50 Mhz Antennas   By ON4ANT    
Six Metre Long-wire Aerial   By Brian D. Williams, GW0GHF             Six Meter Halo   From W3DHJ    
6M and 2M Yagi   From The Antenna Elmer                      Optimised Six-Metre Yagi   by Brian Beezley, K6STI
Six Metre Indoor Loop   By Colen Harlow, G8BTK            Six Meter Antennas A Bunch  From The UKSMG News 
Six Metre Antenna    By Maurius - ZR6YY                        Six Meter Sloop  By K0FF    
Six Meter Antennas A Bunch   From 6MT.com                  50Mhz 6 Element Yagi  By G3PTO    
50 MHz 6 Element Beam  By DF9CY                                Copper Cactus J-Pole antenna  Plans for 52MHz  By KG0ZP

2 meter
Cheap Yagi Antennas for VHF/UHF  From The Clear Lake Amateur Radio Club    2 Meter Antennas A Bunch   From 6M.com   
BiQuad For 2m/440   FROM KE4UYP                                            Super-J Collinear  By Gene KD4OUN   
6dB COLINEAR VHF ANTENNA    From Harry Lythall - SM0VPO      Stacked J-Pole Plans I   
Copper Cactus J-Pole antenna  By KG0ZP                                   2m Quagi By W5UN   
2M Fan Antenna (Yes From an Electrical fan)                                Stacked J-Pole Plans II   
Halo Antenna 2m From N2KBK                                                    2 METER SSB SQUARE LOOP From N4UJW    
SlimJim 2m Antenna                                                                  SlimJim Travelers Antenna    
Sperrtof 2M Antenna aka Sleeve Dipole or Sleeve J-Pole. By ON4CFC PDF    VHF Magnetic loop By ON1DHT    
2m 7 Element Yagi                                                                    2m 10 Element Yagi 

N2NJH's Antenna Roundup  Build a J-Pole for any frequency - Incl. an Excel Spreadsheet!, Pocket J-Pole,  Half Wave J-Pole, Stacked 5/8, Field 2m Colinear,  2m Colinear in PVC, 2m Halo, Eggbeater Loop Antenna

From Ross Anderson W1HBQ: Simplest Collinear 2m Quadix 4 element Grid Yagi      6 element 2 meter, simulated gain is11.9 dBi at 144 MHz Circularly polarized omni for 2 meters called The Cycloid Collinear Horizontally polarized collinear (horizontal omni)

220 MHZ Antennas

Cheap Yagi Antennas for VHF/UHF -- From The Clear Lake Amateur Radio Club
220 MHz Quickie Quarter Wave Antenna -- From Artsci
144/220 MHz J Pole Antenna -- From N6ZAV

430-440 MHZ Antennas

Coaxial Collinear Antenna  From N9ZIA

430 MHz Antennas A Bunch   From 6MT.com   
432 8 Element Quagi Antenna By N2KBK   
440 MHz -- 2 Element & 4 Element Yagi's  From The Antenna Elmer

9dB 70cm Collinear Antenna From Coax N1HFX

900 MHz Antennas/etc

900 MHz Antennas A Bunch -- From 6MT.com

GHz Antennas   

GHz Antennas A Bunch  From 6MT.com   
Cheap Yagi Antennas for VHF/UHF  From The Clear Lake Amateur Radio Club    1270Mhz Yagi Antenna   
Microwave Antennas and Greg's Wireless Networking Info Page   
2.4Ghz Omni Antenna   
A K-Band Receiver For AO-40   K5OE     Patch antenna K3TZ
Dual Patch feed   K5OE