Yes, there are many things that can affect your antenna's signal. Since these things listed below are always changing, so can your Internet antenna's signal.

Reflection: Reflection is the phenomenon of a propagating wave being thrown back from a surface. Reflections result from the surface of the Earth, buildings, walls, and other large objects. When the surface is smooth, the reflected signal may remain intact, but some absorption and scattering of the signal is likely. Multipath can cause signal degradation or cancellation.

Refraction: Refraction occurs when sound wave changes mediums. (The wave bends as it passes through a medium of different density.) As a RF wave passes into a denser medium (such as a trough of cold air lying in a valley), the wave bends, so its direction changes. Some of the wave reflects away from the intended signal path, and some bends in another direction altogether. Refraction is mostly a concern when dealing with longer links. Atmospheric conditions might bend the signal away from the intended receiver.

Diffraction: Diffraction is the apparent bending of light waves around obstacles in its path. It occurs when an object with a rough or irregular surface obstructs the radio path. Diffraction is the effect of waves bending or turning around the obstruction. We can explain diffraction by looking at our pebble in the pond example again. Suppose when you threw a pebble into water, a small stick was stuck in the muck. (Say that real fast five times.) The waves rippling out hit the stick. The stick blocks some waves, but most bend around the stick.

Scattering: Scattering occurs when the wave passes through a medium consisting of many small objects compared with the wave itself. Rough surfaces, small objects, or other irregularities such as foliage, street signs, or streetlights can cause the signal to scatter.

Absorption: Absorption occurs when a RF signal strikes an object and does not pass through, reflect, or diffract around the object. The object absorbs the incoming signal.

Free Space Loss: As the wave propagates away from the source, it loses steam and eventually peters out. This phenomenon is free space loss and is similar to attenuation in a copper cable.

Fresnel Zone: Before looking at RF units of measure, you need to understand one more concept about waves: the Fresnel zone. The Fresnel zone occupies a series of concentric, ellipsoidal areas around the line-of-sight (LoS) path. This area is important because it defines an area about the LoS that you should ensure is not blocked. Trees, towers, buildings, and other solid objects in the Fresnel zone can absorb, scatter, reflect, or diffract a signal and cause degradation.

Distance: The closer you are to a transmitter the better your signal quality and speeds will be. Ideal distances are within 10 miles from the transmitter. At 15 miles, your speeds may be cut in half. Customers at 20+ miles out may have one-third the speed that is possible at >15 miles out.