Originally posted by upNdown
Right. My question is, will it be TOO MUCH antenna? Isn't that how you get multi-path problems?
No. Multipath problems actually come from having too little antenna.
The higher the gain of an antenna, the more directional it is. The more directional the antenna, the less likely it is to pick up bounced signals on the side lobes. The less side lobe signals it picks up, the less likely a multipath signal will be strong enough to interfere with reception.
Attenuators work in multipath environments not because they reduce the capabilities of the antenna, but because they reduce the strength of all signals reaching your receiver. When you listen to a complicated piece of music, you can turn the volume down low enough so you can only hear the primary instruments. When you turn it up, even the faint instruments become audible. Essentially, an attenuator turns down the volume, hopefully leaving the one crisp, clear signal you actually want while "muting" the quieter reflected signals.
There is no such thing as too much antenna.
There is, however, such a thing as too much amplification. Preamplifiers (and amplifiers, an inferior version of the preamp because it seeks to amplify the signal only after it has suffered transmission line loss) work in reverse of an attenuator. They turn the volume up. Turn up the volume enough and even the weakest reflection becomes strong enough to confuse the receiver. However, when background "hiss" is almost equal to the strength of the received signal, there is no alternative - more antenna or more amplification is necessary to get a digital lock.