I want to pick-up NY station from 45 miles away.
I turned the antenna, and couldn't get anything.
Can anyone recomend a good amplifier to get them in.?
It doesn't have to be RS.
The Philly stations 30 miles at strength 80-90.
Manhatten is 40 miles

I had pretty poor results with the Radio Shack pre-amplifier. I replaced it with a low noise high gain unit from the Channel Master Titan 2 series; solid signals now on all channels since 2001. (www.starkelectronic.com was my source)
ToddK

If your lead-in is shorter than 40 feet then an amplifier will make little difference. If less than 150 feet and you can't even get a signal-lock with your current antenna then the best an amplifier would likely do is get a signal-lock with frequent drop-outs, and you will not be happy with that at all. I suggest a bigger antenna. UHF antennas must not point through trees.

The Channel Master 7775 and 7777 mast-mounted amplifiers ($70) have the lowest published noise figure. I can't make a recommendation on Radio Shack since they don't publish noise figures.

Sometimes a 2nd antenna is better than an amp, especially if the signal is not too weak but has multipath, which you may have (aren't there a lot of hills between NY and Philly?. The 2 can, when done right, increas gain and cut out multipath. Here's my story:

I have similar situation- I tried a RS preamp (15-1108) on a RS Yagi in my attic (15-2160) with 75' RG6 into a Sammy T151. The amp claims up to 26dB, with an adjustable 10dB pad. I called RS, and found a 7.5dB noise figure at 600MHz. The balun with it has 7dB feedthrough loss at 600MHz, but RS couldn't tell me if the gain spec was before or after that loss.

I have to split a 90 deg compass difference to pick up all my stations, which are 35-40 mi away, flat land (MAJOR CONTRIBUTOR). The big ones all come in great (7-9 bars) no matter where I point the antenna, but I wanted to get the 3 fringy guys that are 40mi and low (25-50kW) power. With no amp, I get them with 2 bars and dropouts. There are some treetops in the line-of-sight to the fringy guys, and I'm in the attic- the dropouts tell me "multipath" which I later confirmed with a friend's spectrum analyzer. No amp will help with that.

Anyways, I had to turn it almost all the way up just to get anything. I went from nothing to 9 bars on all the stations which I got well even without the amp. The fringe ones that I was trying to pull in- I got zero from them at all settings (I at least got 2-3 bars with dropouts without the amp). Like I said, amps won't help multipath.

I got a 2nd identical antenna, lined them up vertically 18in apart (took off the reflector V arrays), and used identical balun transformers with 14.5in of RG6 coax into a 3dB splitter/combiner. The lengths and alignments are important to keep phase matching and to get gain while squeezing out multipath. No preamp.

All problems solved- my fringies come in at 2-3 bars, but no dropouts anymore. Its a UHF only antenna, so they are narrow, and about 3' long. Not too obtrusive, and impressive to show fellow geek friends!