hey guys...i am looking to see if I can expect to reliably pick up OTA HD in my area....I have tried it up till now with a Terk Indoor directional antenna but its suuper sensitive (it seems) and I have had mixed results with it:

* yellow - uhf WTIC-DT 31.1 FOX HARTFORD CT 0° 12.7 31
* yellow - uhf WVIT-DT 30.1 NBC NEW BRITAIN CT 0° 12.5 35
* yellow - uhf WEDH-DT 45 PBS HARTFORD CT 0° 12.7 45
* red - vhf WEDY-DT 6 PBS NEW HAVEN CT FCC Ext 220° 15.2 6
* red - uhf WFSB-DT 3.1 CBS HARTFORD CT 9° 17.4 33
* red - vhf WTNH-DT 10.1 ABC NEW HAVEN CT 246° 11.5 10
* blue - uhf WCTX-DT 59.1 MNT NEW HAVEN CT 246° 11.5 39
* blue - uhf WUVN-DT 18.1 UNI HARTFORD CT 9° 17.3 46
* violet - vhf WTXX-DT 20.1 CW WATERBURY CT 0° 12.7 12
* violet - vhf WWLP-DT 22.1 NBC SPRINGFIELD MA 19° 38.9 11

As far as the lay of the land goes, I live in a condo complex so I probably cant put anything on the roof. Here are acouple pics of my unit, an end unit:
http://nepoc.org/woops/G361739_201_22.jpg
http://nepoc.org/woops/G361739_101_12.jpg

So it is a 3 story building but I have all 3 stories, and it is surrounded by simlar 3 story buildngs but the one behind me (down the grassy hill) starts about 1 story lower (and thus its roof isnt as high as mine) and the building in across from me is about 30-40 feet away. One of the reasons I think I have been having so much trouble is because that wall of 3 windows on the end of the bldg faces almost directly south and according to what is above....the towers are almost due north. The signals I have been able to get so far have been largely by putting the terk in the little sticket outywindow above the garage, pointed as close to due north as I can, and pretty high up to clear that tree.

Is there any kind of indoor, or subtle outdoor (that I could mount on one of my balconies) antenna that will get me decent OTA HD coverage?

tia

Problem is you have a mix of uhf and vhf channels, I suggest you start in the local reception forum to see what others around you are using for reception.

http://www.avsforum.com/avs-vb/showthread.php?t=315169

Connecticut is not easy because of the mixture of directions and both VHF and UHF stations.

Can you put antennas in the attic?

I'd consider a small VHF only for ABC on channel 10 aimed at New Haven such as:
http://www.solidsignal.com/prod_display.asp?PROD=Y5-7-13

For UHF aimed north, a four bay UHF only such as the CM 4221:
http://www.starkelectronic.com/allant.htm

Use the CM 0549 to add them together.
http://www.warrenelectronics.com/Antennas/joiners.htm

This is not designed to get WWLP, WTXX, or WCTX.

If you want WTXX, use a medium sized all channel antenna instead of the 4221 and get a channel 10 Jointenna to add the WTNH signal. The downside is it's bigger and more expensive. Adding WCTX would require two all channel antennas, a splitter for the New Haven antenna, and Jointennas for channel 10 and 39.