Wow! First let me say that I am intrigued by antennas. A piece of wire or some plumbing can get you on the air... Here are some links to antennas that I have built, and some commercial antennas that I dream of owning or have already used.
The 2-Meter TV Twin Lead Roll-up J-Pole - I've made a few different roll-up J-Pole antennas, this one seems to be the best. Let me make a suggestion, get yourself some Wireman 562 (300 ohm, 18 AWG, 19 strand copper-clad steel conductors, poly-clad 'window' for full power) twinlead. This is available at thewireman.com. This stuff is fantastic! Anyway, I built one to spec, then using a borrowed MFJ-259b Antenna Analyzer I trimmed maybe 1/2 inch off the top to get 1.0:1 SWR at 147.000 MHz...PERFECT!!!
The Do It Yourself J-Pole - this is the first antenna I built to get me started on 2 Meter FM. Works great.
The W5GI Mystery Antenna - this is the first HF antenna I built to get me started once I passed my Element 1 (CW) Exam. My son and I threw this up between some trees and were amazed to hear everything in the US, Central & South America that came roaring in on all bands from 10 Meters down to 80 Meters. Don't forget that just because you can hear someone on a frequency doesn't mean you can talk to them unless you are licensed for that frequency.
The 40 Meter Dipole - Once I built my RockMite QRP Rig, I needed a 40 Meter dipole for portability. some 22 AWG Speaker wire, 3 small pieces of PVC, and a piece of coax with a connector on one end and I was on my way.
The Butternut HF6V Vertial Antenna - This was one of the antennas we used for field day. I loved not having to throw it in a tree, just drive a piece of rebar in the ground, erect the antenna, attach the ground radials and feedline and you are on the air. At field day, we also attached 3 guy lines. I am trying to talk my wife into one of these in the back yard. Wish me luck.
The G5RV Dipole - Another antenna we used at field day. This is an extremely effective antenna that can be purchased for about $35, or if you are a DIY kind of guy, it can be built for probably a little less.
The Comet GP3 - This is the antenna that we installed on the local Police Department and Sheriff's Office just before Hurricane Rita arrived. These held up to the storm (we had wind gusts to 55mph) with no problems. I want one of these for both my home and office.
WA5VJB Cheap Yagi for VHF/UHF - This is the latest antenna I have been working on. I built the 222 MHz and 432 MHz versions to get ready for the January VHF Contest. I altered the plans a little. I hope to get some pictures up soon.
KU4AB SQ Loop - Talk about amazing! I have 2 of the 2 Meter loops mounted with a phasing harness and can hear a 2 Meter Side Band contact from 70 miles away almost as if we were on the FM repeater. Get this, my stack was mounted on top of my mini-van.
Directive Systems Loop Yagi - I saw this antenna for the first time at Marshall's (K5QE) Contest Station. These are primarily used for frequencies between 902 MHz and 5.7 GHz. Many of the guys I know who VHF/UHF Contest use these. I'm new to VHF/UHF Contesting, give me some time, I'll have at least one of these.