1270MHz Yagi Antenna by OE3MZC
Build your own antenna for the 23cm band ( 1250Mhz - 1280Mc ) using some aluminium and the following simple design. Due to a large number of reflectors front to back ratio is excellent. The average gain is about +12 dbd.
http://www.qsl.net/oe3mzc/antenna.htm

A Double Quad Antenna for 1296 MHz by DL5NEG
This antenna is a medium gain directional antenna for mobile (portable) and base station use. I have built it many years ago for mobile operation to check out how good the signal of the ATV Relais DB0SCS is received ...
http://www.herbert-dingfelder.de/23cm_ant/23cm_ant.htm

An Inexpensive External GPS Antenna by N7KKQ
If you operate APRS or just need an external antenna for your GPS receiver, here’s one that is easy to build yet offers surprisingly good performance in a compact size. ..., it uses commonly available components and materials.
http://www.arrl.org/tis/info/pdf/0210036.pdf

Bi-Quad Antenne voor 23 cm ATV door PA2RF
Het ontwerp van een bi-quad antenne voor 23 cm (1,3 GHz) is populair bij beginnende ATV-ers. Bi-quad antennes zijn eenvoudig en snel te maken en ze hebben een redelijke gain (8-14 dBi).
http://www.freepages.at/brink120/ron/450.htm

Parabolic Dish Ring Feed by DL4MEA
For illuminating a parabolic dish with small f/D (around 0.4, not critical) a ring feed can be used. Its advantages are a wide illumination in both axis' without a large shadowing of the dish. It offers linear polarisation.
http://www.qsl.net/dl4mea/ringfeed.htm