“Not necessarily. Fiberglass aircraft, for incidence, are almost invisible to radar and it’s not because they are absorbing or reflecting RF energy.”
This is not a fiberglass aircraft. Otherwise it would not be necessary for it to have planform alignment, gaussian shaping, edge treatments etc.
There will be 20-30dB of attenuation from ground-level sources - so satcom links, including GPS will be very difficult to jam.
If you make something out of fiberglass you either treat the fiberglass to make it non-transparent with a gradual dielectric gradient coating, or you have to treat everything inside the aircraft - a far more complex challenge. You could make a glider out of fiberglass and it would be very stealthy, it also wouldn’t have any utility or capability.
It's not carbon, either. Note the dent in the leading edge on the left side. Fiberglass, Kevlar and Carbon composites don't dent like that. There are some rather exotic plastics being used now. I'd guess it's either aluminum or one of those.
Otherwise it would not be necessary for it to have planform alignment, gaussian shaping, edge treatments etc.
There is no "one thing" that encompasses radar stealth. It's a combination of things to reduce radar return signature. Among those are overall shape, material composition, material coatings and on-board electronic countermeasures.
If you make something out of fiberglass you either treat the fiberglass to make it non-transparent with a gradual dielectric gradient coating, or you have to treat everything inside the aircraft - a far more complex challenge.
Actually, if you want to "show up" on radar in a fiberglass aircraft you use a corner reflector, although the engine produces a fairly strong return signature in certain orientations.
You could make a glider out of fiberglass and it would be very stealthy, it also wouldn’t have any utility or capability.
The Brazilian Navy and Brazilian Federal Police have been using a fiberglass motorglider called the "Ximango" for coastal patrols and aerial observation for over 25 years. It's cheap to operate and it's very stealthy with no added enhancements. Since Chavez has taken power it's also been used regularly along the border with Venezuela and to monitor narcotics smuggling along the Colombian and Bolivian borders, too. Earlier this year I consulted on a project where a group of investors were considering purchasing the company that manufactures the Ximango. The goal was to develop a stealthy, long range, manned observation platform from the design.